DEMO - 1970 Colorized Mustang Wiring and

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A consolidated collection of original Ford
electrical & vacuum diagrams with illustrations
Color diagrams for:
Automatic Transmission
Convenience System
Exterior and Interior Lights
H eating and Air Conditioning
Horns and Convertible Top
Ignition, Starting and Charging
Instrument Panel, Tachometer
Radio, Stereo and Speakers
Windshield Wiper and Washer
Warning Lights and Console
Warning Buzzer
>or .....
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All Rights Reserved. Copyright 2008
ForeI PubllshIng Company, LLC
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Copyright © 2008, Forel Publishing Company, LLC, Woodbridge, Virginia
All Rights Reserved. No part of this book may be used or reproduced in any manner whatsoever
without written permission of Forel Publishing Company, LLC. For information write to Forel
Publishing Company, LLC, 3999 Peregrine Ridge Ct., Woodbridge, VA 22192
1970 Colorized Mustang Wiring and Vacuum Diagrams
(Extracted from Form 7098-70-3, Form FD-7795P-70, FP-7635B, and FD-7943-G)
EAN: 978-1-60371-029-9
ISBN: 1-60371-029-9
Forel Publishing Company, LLC
3999 Peregrine Ridge Ct.
Woodbridge, VA 22192
Email address: webmaster@ForelPublishing.com
Website: http://www.ForelPublishing.com
This publication contains material that is reproduced and distributed under a license
from Ford Motor Company. No further reproduction or distribution of the Ford Motor
Company material is allowed without the express written permission of Ford Motor
Company.
Note from the Editor
This product was compiled using several original Ford Motor Company publications. In some cases, there are slight
differences between publications, so it is important to compare between diagrams, schematics, or illustrations. The
contents of this product were extracted from: 1970 Car Shop Manual (Form 7098-70-3, September 1969),
1965/1972 Ford Car Master Parts and Accessory Catalog (Form FP-7635B, May 1975, and 1970 Wiring Diagrams
(Form FD-7795P-70) and How to Read Wiring Diagrams (FD-7943-G).
Disclaimer
Although every effort was made to ensure the accuracy of this book, no representations or warranties of any kind are
made concerning the accuracy, completeness or suitability of the information, either expressed or implied. As a
result, the information contained within this book should be used as general information only. The author and Forel
Publishing Company, LLC shall have neither liability nor responsibility to any person or entity with respect to any
loss or damage caused, or alleged to be caused, directly or indirectly by the information contained in this book.
Further, the publisher and author are not engaged in rendering legal or other professional services. If legal,
mechanical, electrical, or other expert assistance is required, the services of a competent professional should be
sought.
ATTENTION
Please Read This
It is important to note that differences exist between similar or like wiring diagrams even though
they are original Ford publications. It is for this reason there may be multiple versions of what
appears to be the same wiring diagram. If your vehicle has a color coded wire that does not match
a diagram you should consult the other diagrams contained in the manual for a possible match.
Example of differences
In the wiring diagrams from the Ford
publication Form 7795P-70F, the Mustang
Exterior Lights Wiring Color Code shows:
297 Yellow-Green
However, in the Wiring Color Code
section of the Mustang Warning Lights it
has:
297 Black-Green
Then, in the Wiring Color Code section
The color coded wiring diagrams are provided for
of the Automatic Transmission, it has:
illustration purposes only. Only the wire number
297 Blue-Green Stripe
should be used for the identification of the wire
itself. The color coding of the wires in the product
may not match the actual colors of the wires in the vehicle. In some cases, the colors have been
altered to provide a visual contrast (i.e. the color white has been shaded to make it more visible).
As stated in the paragraph above, there are some variation and/or differences between the original
Ford wiring diagrams. If your vehicle has a color coded wire that does not match a diagram you
should consult the other diagrams contained in the manual for a possible match.
Disclaimer: Although every effort was made to ensure the accuracy of this book, no
representations or warranties of any kind are made concerning the accuracy, completeness or
suitability of the information, either expressed or implied. As a result, the information contained
within this book should be used as general information only. The author and Forel Publishing
Company, LLC shall have neither liability nor responsibility to any person or entity with respect to
any loss or damage caused, or alleged to be caused, directly or indirectly by the information
contained in this book. Further, the publisher and author are not engaged in rendering legal or
other professional services. If legal, mechanical, electrical, or other expert assistance is required,
the services of a competent professional should be sought.
1970 Color Wiring Codes
Number
Wire Description
Source
Number
2
WHITE-BLUE STRIPE
Form 7795P-70F
37A
3
GREEN-WHITE STRIPE
Form 7795P-70F
4
WHITE-BLACK STRIPE
5
Wire Description
Source
BLACK-YELLOW STRIPE
Form 7795P-70F
38
BLACK
Form 7795P-70F
Form 7795P-70F
38A
BLACK
Form 7795P-70F
ORANGE-BLUE STRIPE
Form 7795P-70F
38B
BLACK
Form 7795P-70F
8
ORANGE-YELLOW STRIPE
Form 7795P-70F
39
RED-WHITE STRIPE
Form 7795P-70F
9
GREEN-ORANGE STRIPE
Form 7795P-70F
40
BLUE-WHITE STRIPE
Form 7795P-70F
10
GREEN-RED STRIPE
Form 7795P-70F
44
BLUE
Form 7795P-70F
11
GREEN-YELLOW STRIPE
Form 7795P-70F
48
Not Listed
Form 7795P-70F
11
BLACK-YELLOW STRIPE
Form 7795P-70F
49
WHITE-BLUE STRIPE
Form 7795P-70F
BLACK-YELLOW STRIPE
FORM 7795P-69
50
GREEN-WHITE STRIPE
Form 7795P-70F
12
GREEN-BLACK STRIPE
Form 7795P-70F
53A
BLACK-BLUE STRIPE
Form 7795P-70F
13
RED-BLACK STRIPE
Form 7795P-70F
53B
BLACK-BLUE STRIPE
Form 7795P-70F
14
BLACK
Form 7795P-70F
53C
BLACK-BLUE STRIPE
Form 7795P-70F
15
RED-YELLOW STRIPE
Form 7795P-70F
53D
BLACK-BLUE STRIPE
Form 7795P-70F
16
RED-GREEN STRIPE
Form 7795P-70F
53E
BLACK-BLUE STRIPE
Form 7795P-70F
BLACK-BLUE STRIPE
Form 7795P-70F
11A
16
PINK
Form 7795P-70F
53F
16A
PINK
Form 7795P-70F
54
GREEN-YELLOW STRIPE
Form 7795P-70F
19
BLUE-RED STRIPE
Form 7795P-70F
54A
GREEN-YELLOW STRIPE
Form 7795P-70F
19A
BLUE-RED STRIPE
Form 7795P-70F
54B
GREEN-YELLOW STRIPE
Form 7795P-70F
19B
BLUE-RED STRIPE
Form 7795P-70F
54C
GREEN-YELLOW STRIPE
Form 7795P-70F
19C
BLUE-RED STRIPE
Form 7795P-70F
54D
GREEN-YELLOW STRIPE
Form 7795P-70F
19D
BLUE-RED STRIPE
Form 7795P-70F
56
BLUE
Form 7795P-70F
19E
BLUE-RED STRIPE
Form 7795P-70F
57
BLACK
Form 7795P-70F
21
YELLOW
Form 7795P-70F
57A
BLACK
Form 7795P-70F
22
BLUE-BLACK STRIPE
Form 7795P-70F
57B
BLACK
Form 7795P-70F
25
BLACK-ORANGE STRIPE
Form 7795P-70F
57C
BLACK
Form 7795P-70F
26
BLACK-RED STRIPE
Form 7795P-70F
57H
BLACK
Form 7795P-70F
26A
BLACK-RED STRIPE
Form 7795P-70F
58
WHITE
Form 7795P-70F
28
BLACK
Form 7795P-70F
63
RED
Form 7795P-70F
29
YELLOW-WHITE STRIPE
Form 7795P-70F
122
YELLOW
Form 7795P-70F
30
BLACK-GREEN STRIPE
Form 7795P-70F
123
RED
Form 7795P-70F
30
VIOLET
Form 7795P-70F
137
YELLOW-BLACK STRIPE
Form 7795P-70F
VIOLET (Resistance Wire)
Form 7795P-70F
140
BLACK-RED STRIPE
Form 7795P-70F
31
WHITE-RED STRIPE
Form 7795P-70F
140A
BLACK-RED STRIPE
Form 7795P-70F
32
RED-BLUE STRIPE
Form 7795P-70F
152
YELLOW
Form 7795P-70F
32A
RED-BLUE STRIPE
Form 7795P-70F
152
GREEN-BLACK STRIPE
Form 7795P-70F
30A
32B
Not Listed
Form 7795P-70F
159
Not Listed
Form 7795P-70F
34
GREEN-BLACK STRIPE
Form 7795P-70F
161
GREEN
Form 7795P-70F
35
ORANGE
Form 7795P-70F
162
GREEN-RED STRIPE
Form 7795P-70F
37
BLACK-YELLOW STRIPE
Form 7795P-70F
175
BLACK
Form 7795P-70F
37
GREEN-YELLOW STRIPE
Form 7795P-70F
215
YELLOW-BLACK STRIPE
Form 7795P-70F
Number
Wire Description
Source
257
YELLOW
Form 7795P-70F
262
BROWN
268
Wire Description
Source
951
GREEN
Form 7795P-70F
Form 7795P-70F
977
VIOLET
Form 7795P-70F
RED
Form 7795P-70F
984
BROWN
Form 7795P-70F
269
BLUE
Form 7795P-70F
270
BLACK
Form 7795P-70F
296
RED
Form 7795P-70F
297
BLACK-GREEN STRIPE
Form 7795P-70F
297
BLUE-GREEN STRIPE
Form 7795P-70F
297
YELLOW-GREEN STRIPE
Form 7795P-70F
297A
BLACK-GREEN STRIPE
Form 7795P-70F
297A
BLUE-GREEN STRIPE
Form 7795P-70F
348A
GREEN
Form 7795P-70F
348B
GREEN
Form 7795P-70F
365
BLUE-RED STRIPE
Form 7795P-70F
366
Not Listed
Form 7795P-70F
367
GREEN-WHITE STRIPE
Form 7795P-70F
383
RED-WHITE STRIPE
Form 7795P-70F
450
Not Listed
Form 7795P-70F
460
YELLOW
Form 7795P-70F
469
GREEN
Form 7795P-70F
478
GRAY
Form 7795P-70F
482
BLUE-YELLOW STRIPE
Form 7795P-70F
482A
BLUE-YELLOW STRIPE
Form 7795P-70F
490
BLACK-RED STRIPE
Form 7795P-70F
511
GREEN
Form 7795P-70F
520
VIOLET
Form 7795P-70F
627
BLACK-VIOLET STRIPE
Form 7795P-70F
640
RED-YELLOW STRIPE
Form 7795P-70F
643
YELLOW-BLACK STRIPE
Form 7795P-70F
654
YELLOW
Form 7795P-70F
655
RED
Form 7795P-70F
70
GRAY
Form 7795P-70F
708
BLACK
Form 7795P-70F
709
BLACK-GREEN STRIPE
Form 7795P-70F
763
ORANGE-WHITE STRIPE
Form 7795P-70F
806
807
WHITE
ORANGE
Form 7795P-70F
904
VIOLET
Form 7795P-70F
904
VIOLET (Resistance Wire)
Form 7795P-70F
904
GREEN-RED STRIPE
Form 7795P-70F
950
WHITE-BLACK STRIPE
Form 7795P-70F
Form 7795P-70F
Number
Note – wire color codes highlighted in RED
designate a difference either between the original
Ford wiring publications or within the same
publication. Those highlighted have the same wire
number but have different color codes.
Source Document
Ford Publication Form 7795P-70
COURSE 13003 and 1703
WIRING and VACUUM
SERVICE
TRAINING
FORM 7795P- 70
HOW TO USE THE WIRING DIAGRAMS
THE INDEX PAGE IS THE FIRST PAGE IN EACH SECTION. EACH ELECTRICAL
SCHEMATIC WILL HAVE A NOTATION AS TO THE SOURCE OF POWER FOR
THAT SYSTEM. ALL W IRES WILL BE SHOWN AS SINGLE LINES TO PROVIDE
A CLEAR UNDERSTANDING OF THE DIAGRAMS. TO TRACE A CIRCUIT, IT IS
RECOMMENDED TO START AT THE GROUND CIRCUIT OF THE INOPERATIVE
COMPONENT, TRACE IT THROUGH ALL CONNECTORS TO THE SOURCE,
AND NOTE THE POSSIBLE TROUBLE AREAS AND POINTS OF MOST CON·
VENIENT ACCESS. WIRE CONNECTORS WILL BE IDENTIFIED ON THE
SCHEMATIC AND THE PICTORIAL DRAWINGS, THIS WILL SHOW THE TECH·
NICIAN THE LOCATION OF THE CONNECTORS. MOST WIRE CONNECTORS
. .
ARE SHOWN IN OPEN BOOK FASHION. A WIRE ON THE TOP RIGHT OF A
CONNECTOR (OPEN SIDE BY SIDE) WILL BE ON THE TOP LEFT SIDE OF THE
OTHER HALF OF THE CONNECTOR. SEE FIGURE 1 (WIRE # 140 TO # 140A, ETC.).
WIRE DISCONNECTS AND CONNECTORS WILL ALL BE BLACK UNLESS
A COLOR CODE IS NOTED ON THE DIAGRAM. THE COLORED DISCONNECTS
AND CONNECTORS ARE TO AID THE TECHNICIAN IN FINDING THE PROPER
CIRCUIT TO BE TESTED OR TRACED. THE ELECTRICAL SYMBOLS AND THEIR
MEANINGS ARE NOTED ON EACH DIVIDER PAGE TO PROVIDE A CLEARER
UNDERSTANDING OF THE DIAGRAMS. PICTORIAL DRAWINGS OF A COM·
PONENT WILL INCLUDE THE SPECIFIC LOCATION OF SOME COMPONENTS
IN CASES WHERE IT IS DIFFICULT TO DETERMINE IF THE COMPONENT IS
UNDER THE INSTRUMENT PANEL OR IN THE ENGINE COMPARTMENT.
RELAYS AND SWITCHES ARE SHOWN IN THE " SYSTEM OFF" POSITION.
IF A VEHICLE SPECIFIC WIRE COLOR IN A CONNECTOR DOES NOT MATCH
THE DIAGRAM SHOWN, IT CAN USUALLY BE IDENTIFIED BY COMPARING
THE OTHER COLORS SHOWN AT THE WIRE CONNECTORS. SPECIFIC WIRE
COLOR DEVIATIONS IN THE MANUFACTURING OF A WIRE HARNESS ARE
USUALLY FOR A SHORT DURATION.
I L 14 OA-+6i;-;;®~
e®
®e
460
o
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r
250
#
Fi gure 1
I~I:I
o
oe
eo
140
roli}- 250
~
SWITCHES
CIRCUIT SYMBOLS
-'-~
JlIUl.
-'Wv-
HEATER
RESISTOR OR
RESISTANC E WIRE
----"
6<l
PUSH TYPE N.D.
~tto. (SPST)
HORN
~
CIRCUIT BREAKER
H,C. (SPST)
FUSE
RHEOSTAT
(VARIABLE RESISTAt{CE )
--i+-
...l..
cJ\..O
~
SPEAKER
PUSH TY PE ItO.
MUl TlPL.E POLE
GROUND
--1(-CAPACITOR OR
~
-00-
PUSH TYPE N,C.
DIODE
CO~DENSER
-if>THER MIS TOR
SPLICE, WEL D OR
SOLDER POINT
SPLICED WIR ES
--"
MOMENTARY CONTACT
~
JUNCTION BLOCK
+
+
CROSSOVER WIRE
BUSS BAR
BUSS BAR & SPLICE
ROTARY SWITCH
(SPOT) CHnER OFF
(NO CONNECTION)
-1 1111111f-
DISTRIBUTOR
n
N.C.
PRESSURE OR VACUUM
OPERATED N.C.
MERCURY SWITCH
HART
BATTERY
"
BUSS BAR
:' ,
,
,-'
-. •
,' .......
...... --T
(
POTEN TI OMETER
.~
',
",
, /'
TRANSISTOR
/'\70~jo'~
<2-.@. _~Ch _.@....sD
BREAKER POINTS
()
10
01
BUSS BAR
THERMAL SWITCH
EXTERNAL HEATER N.C.
TURN SIGNAL SWITCH
N.O. _ NOR MALLY OPEN
N.C. - NORMALLY CLOSED
S.P.S.T. - SINGLE POLE. SINGLE THROW
D. P.S. T. - DOUBLE POLE, SINGLE THROW
S.P.D.T. _ SINGLE POLE , DOUBLE TH ROW
D.P.D.T. - DOUBLE POLE, DOUB LE THR OW
<
o
"r ;.
-o-?-
+
--0
MAINTA INED CON TAC T
---,,>'4
SPARK PLUG
THERMAL. SWITCH
INTERNAL HEATER N.C.
9~
---..
.......
THERMAL SWITCH
INTERNAL HEATER H.C.
,
i
.
.
." \""
coc.
IGNITION SWITCH
O-E1
9·1·69
RELAYS
CONNECTORS
SPADE HOT USED
~
N.O. (OPST)
1\',--
--
lie
NOT USED
PLUG
PLUG
®
N.O. (SPST)
(SPOT)
~
0
=~
BULLET
CONNECTOR
SOLENOID
II~
SOLENOID
E
N.C. (SPST)
r::~
01
01
,0
D.
'0
0'
,, D 0,,
~
'T:.'.7t
MALE
FEMALE
n
SPADE
CONNECTOR
®
'D D:
'0
'0
~AlE
FEMALE
MALE
00
00
MULTIPLE
PLUG
COVER FOR
CONNECTOR PINS
MALE
MOTORS
~
IGN ITION COIL
BASIC SERIES
DPOl
--<P-
PERIUHENl MAGHE·...
LAMPS
MAP LAMP REL AY
N.O. _ NORMALL Y OPEN
N.C. _ NORMALL Y CLOSED
S.P.S.T. _ SINGLE POLE, SINGLE THROW
C.P.S.T. - COUBLE POLE, SINGLE THROW
S.P.D.T. - SINGLE POLE, DOUBLE THROW
D.P.D. T. _ COUBLE POLE, DOUBLE THROW
FEMALE
SPADE
CONHECTOR
, D D,
FEMALE
I I~
N.C. (DPST)
0=:
•• ••
•• ••
• •
~t--~ -- ~ I--
COIL AIR CORE
SINGLE
FILAMENT
STARTER 1oI0TDR
SPLIT SERIES
GAUGES
DOUBLE
FILAMENT
O-E2
9 . 1·69
MUSTANG AND COUGAR
ELECTRICAL DRAWINGS
SECTION
~ICTO."'''
"~ .
· 2-E5 .... .. 2-E28
BRAKE LIGHTS
· 2-E:? .•. . 2-E25
. 2-E:?!
2-E3 ••.
Mustang .
Cougar
CHARGING
2-E2 •. 2-El0& 11
· 2·E3 ., 2-EIO& 11
2-E3 . · 2-E12 &. 13
Mustang
Cougar
Cougar XR7
2-E2 .
.. 2-E34
2-E3 · 2-E22 &. 34
MuSllng ..
Cougar
CIRCUIT PROTECTION
Mustang &. COugar
2-E37
a. 38 ..
' ... 2-E37
CLOCK
Mustang
Cougar
2·E5 ...... 2-E22
2-EI4 .. 2-E22 &. 23
CONVENIENCE SYSTEMS
Cougar
Cougar XR7 (Prove Out) .
2·E9 _,_ .. 2-EIS
779SP-70 F
MlIltlng & Couglr
2·E2&3 .
2-E28
HORNS
KEY WARNING BUZZER
2- E2 & 3 ..... 2-Et9
IGNITION
MUllang
Collgar XA7
Cougar
2-E2 . 2-EIO& II
... 2-E3 . 2-E12 & 13
2·E3 .... 2-E14
... 2-E2&3 . . 2·E19&25
.........
2-EZ9
Mustang .
Cougar ..
Cougar XA7
2-E6
2-E7 · 2-E22 & 23
. 2-E8 ..... 2·E23
. • 2·E2 · .. , · 2·E22
2-E3 .. . .. 2-E22
• 2-E3 .... 2-E25
NEUTRAL SWITCH
... 2-E2 . . 2·E I 6& 17
• .•• 2-E3 · 2-EtS &. 20
Mu stang
Cougar
IC ~ ' MA TIC
2-E9 & t5
POWER WINDOWS
Cougar
2-E4 .•.•. 2-E32
RADIO AND STEREO TAPE
Mustang & Cougar
2·E4 & 5 , 2-E30 & 3t
SEAT BACK LATCH ...
. •.....•...• 2-E9
SEAT BELT REMINDER LIGHTS
2·E2 & 3 . .. 2-E34
STARTING
MUltang
Cougar
Cougar XA-7
2-E2 . . 2-EII
2-E3
2-E12
2-E3 •••• . 2-EI3
TACHOMETER
INSTRU MENT PANEL
Muatang
Cougar
Cougar XA7
PARKING BRAKE WARN ING
LIGHT ...........
.2-E35
INTERIOR LIGHTS
EXTERIOR LIGHTS
Cougar .
HEADLAMP " ON " WARNING
BUZZER .. . . . . . . . . , ......... 2-E36
HEATER AND DEFROSTER
. ....... 2-E!2 &. 15
CONVERTIBLE TOP
Mustang
Mustan g ...........•.•....• 2-E5 ..... 2-E t l
COligar ..............
2-E5 . 2'Et 2 & 13
Cougar XA7 .. ." •....... 2-E5 ..... 2·E14
Mliitang & COllgar
CIGAR LIGHTER
Couga r
~ICTO ~ IA~
GAUGES
Mustang & Cougar
Mustang &. Cougar .
INDEX
... tlC
AIR CONDITIONER
DEFOGGER
2
•. 2-E33
2-EIO
Musta ng & Cougar
2-ES .... 2·EII
TURN SIGNALS
Mustang
Cougar
2-E2 . 2-Et6 & 17
. 2-E3 2·E20 & 2t
VACUUM SySTEMS ..... , .. 2-E39
WINDSHIELD WIPERS AND
WASHERS
Mustang & Cougar
.. 2·E2 & 3 ..... 2-E26
Mustang & Cougar ('nlermittenl) .
2·E27
2-E1
,"0, WI.",
..
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,
· ... .
•
I..' .••.,UIoO'
'Ulvt "'.
...
~O. IU
I""''''
.,.. UC. ul • • n &1.1
....,
TUO' , ...... ...... .
'no
,-
:::::::------1970 MUSTANG OVERALL VIEW
2-E2
--
18... 900 WIRING "'SSY.
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A.H. OOO R
SPEA KER
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1'''''b9 WIR1NG ASSY .
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MIJST ....~ C-COUC ... R RAOIO RECEIVER 000 RE'" R SE ... T SP(.lXER
2-E4
MIJSI"'N~1~~~~~
T"'PE PLAV£R
R"'DIO RECEIVEA
(,1,1,
1970 MUSTANG PICTORIALS
2-E5
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IUO I WIRIIiG ASSY .
MUS rA NG-COUCMt CLOC ~·"'API..A}.''' CI RCUITS
1970 MUSTANG PICTORIALS
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VIIIIlIO ,
~
1970 MUSTANG INSTRUMENT PANEL
2-E6
9-1-69
·"
TlU",,'
.............
.........
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1970 MUSTANG CONVENIENCE SYSTEM
2-E9
9-1-69
II AI: '
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1970 MUSTANG AND COUGAR HEATER AND AIR CONDITIONING
2-E28
Source Document
Ford Publication Form 7795P-70
COURSE 13003 and 1703
WIRING and VACUUM
SERVICE
TRAINING
FORM 7795P- 70
HOW TO USE THE VACUUM DIAGRAMS
IF IT IS A FORD CAR LINE VACUUM SYSTEM, THE TECHNICIAN WILL
FIND A PAGE FOR THE TOTAL SCHEMATIC SYSTEM AS WELL AS A
LISTING FOR A SCHEMATIC AND PICTORIAL OF EACH SUBSYSTEM ON
EACH SECTION INDEX PAGE. IT IS RECOMMENDED THAT THE TECHNICIAN FIRST TURN TO THE TOTAL SYSTEMS SCHEMATIC TO DETERMINE
IF THERE ARE ANY BRANCH SYSTEMS OPERATING FROM THE SAME
SOURCE. THIS WILL ASSIST IN LOCATING SYSTEM TROUBLES. HE WILL
THEN BE ABLE TO TURN TO A PAGE TO FIND DETAILED INFORMATION
ON A PARTICULAR SYSTEM. IN TRACING VACUUM SYSTEMS, IT IS RECOMMENDED THAT A CIRCUIT BE TRACED FROM ITS CONTROL UNIT TO ITS
SOURCE OF VACUUM, AND THEN FROM THE CONTROL UNIT TO THE
OPERATING UNIT, NOTING POINTS OF POSSIBLE MALFUNCTION AND
ACCESSIBILITY.
THE VACUUM SYMBOLS AND THEIR MEANINGS ARE NOTED ON EACH
DIVIDER PAGE TO PROVIDE A CLEAR UNDERSTANDING OF THE DIAGRAMS.
VACUUM
CIRCUIT SYMBOLS
~
U
VACUUM MO TOR OR RESERVOIR
Q
INTAKE MAN IFOLD FITT ING
VACUUM CONTRO L
~
4
OR
Q
T OR 0
MO TOR
1F
9l=
4 - WAY TEE CONNECTOR
{]
VACUUM DISTRIBU TOR
+
OR
§)
~,~
~
--
~
NIPP LE ON A MO TOR
CAP (NO T OPEN)
DUAL VACUU M
TEE CONNECTOR
0
U
RESERVO IR AND
CHECK VA LVE
GROUP CONNECTOR
HOSE CLAMP
~ --DASH PANEL
GROMMET
VACUUM LIN E
CROSSOVER
CONNECTOR
o
CHECK VALVE
00
-
WT5IOE
R~CIRC.
•
•
• •
IRf5T'£TOR I ...
I' AIR OOOfl I
WHITE
•
•
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SWITOl
P.usEMGU
YH.lOl
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I'UIIPLE
, ,
,
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..... TER VALVE
CHECK
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(HCllU'A.L P0511~)
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' ----l
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-:---1
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~~-----=~~------~
lEl.lOW· CLOSE
1970 MUSTANG AND COUGAR TOTAL VACUUM SCHEMATIC
J
"I .. nau ..... ..... .... .
IDIIITIfICA'QIII
• • . • • • . • • •• ,.
. 11
. Il
• IJ
GROUP INDEX
I NDEX and IDENTIFICATION
CHARGING SYSTEM
• •DUTlFICA_...... ..
...
. 11
. 22
EXTERIOR LI GHTS,
HEADLIGHT DIMMER,
TURN SIGNALS, HORNS
INTERIOR LIGHTS,
INSTRUMENTS, INSTRUMENT
PANEL CONTROLS and CLOCK,
VENTILATING, HEATING,
AIR CONDITIONING
11011 ... 100mFICAnOil . . • • • • . . • • . . •
IEAII .. •. . • .• • • •••• . •.• ••..• .. •..•
_ _ .......... " , R• . . .. .. . ..
_ ... HDDDI, ......E
DOD'" r •••lAm •
•
..
41
4Z
AUXILIARY EQUIPMENT:
RADIO, STEREO ,
WINDSHIELD WIPER and
WASHER, LIGHTERS, ASH
RECEPTACLES, MIRRORS, ETC.
a
neFPMlL • • • •
COYER. IIOOD eMIl
TlWllFEI. vrlYL IIOOFS. , ..., .•. ..
maRlOIl TRIM .. . . . . . ... ..... ... ... .,
WIRING, CIRCUIT PROTECTION,
BULB CHARTS
lID' "ELL. EXTERIOR ~
FMIIES. UfII.OERIODY • • • • • • • • • • • • • ..
IIHI ... ID(lnFICATIOI . . • . .
PRUtlUVEIlY
IIAIIITEIIMCE
•. ..
•• II
• . • II
in...'CE...... .. ·
... .. .. ............
.
Q
SERVICE PUBLICATIONS
VACUUM SYSTEMS
SPEED CONTROL,
ANTI-SKID CONTROL
F IRST PRINTING - SEPTEMBER'. 1969
@ 1969 FORO MOTOR COMPANY . DEARBORN, MICHIGAN
FOREWORD
ThiJ manual iJ divided into five volumes: 1 - Chassis, 2 - Engine, 3 - ElectriCllI, 4
- Body, 5 - MainteTUl1lce and Lubrication. These volumes should provide Service
Technicians with complete information covering normal service repairs on all 19 70
model passenger cars built by Ford Motor Company in the U.S. and Canada. As
changes in the product occur, this information will be updated by Technical Service
Bulletins. When issued, 1'$B information always supersedes that published here.
Within each volume, information iJ grouped by system or component plus "General
Service" parts which contain information which iJ common to several similar.components.
The table of contents on the first page of elJCh volume indicates the general content
of the book and provides a handy tab locater to make it easy to find the first page-of
each ''group.'' That page wiU contain an index to "parts" and the first page of each
"ptl11" contains a detailed index which gives page location for each service operation
covered. Page numbers are consecutive in each "part. "
Those who have previously used Ford Shop Manuals will find a major change this
yelll' in the division of information into "groups" and "parts. " To make teference
f!IISier, information has been broken down into smaller units so that essentially there
iJ now one ''part'' for each component or system. Group numbers have been
c1urnged so tMt the first digit of the number indicates the volume in which the
group may be found.
Example:
36 - 05 - 13
Volume 3 - Group 6 - Part 5 - Page 13
We hope tMt this c1urnge in indexing will make it easier and quicker to locate
desiTed information within these manuals.
The descriptions and specifications in this manUQ/ were in effect at the time this
manual was approved for printing Ford Motor Company reserves the right to diJcontinue models at any time, or cMnge speCifications or design, without notice and
without incurring obligation.
~~
SERVICE PUBLICATIONS
30-01-01
30-01-01
GROUP
Identification
w1002·8
100001
MANUFACTURED BY
FORD MOT OR COMPANY
09/69 THIS VEHIC LE CON fORMS
TO ALL APPLICA B LE FE DE RAL
MOTOR VE HI CLE SAfETY STAN-
WI LL V,",I!T
.... ITH
VEHICLE
LINE
DARDS IN EFFECT ON DATE Of
l--+==MANUFACTURE SHOWN ABOVE .
5
30
Warranty identificatioo of the vehicle. The
first number indicates the model yea r. The
leiter following the model year number
indicates the manufacturing assembly
plant, The next Iwo numbers designate
the Body Serial Code followed by a leiter
expressiog the Engine Code. The last six
digits of the Vehicle Idelllification Num·
ber indicale the Consecutive Un il Number.
The remaioing information on the V.C.
Label consists of pertineot vehicle idenlification codes. The BODY code is IWO num erals and a letter identifying the body
Style. The COL (color) code is a number
or letter (or both) indica ting the exterior
paint color code. The TR IM code con·
sists . of a number·letter combination des·
ignlling the io terior trim. The Axle code
is a number or leiter indicatinS the rear
axle ratio and standard or locking type
axles. The TRNS. code is a number or
letter indicating the type of transmission,
numerals for manual and leiterS for auto·
matic or semi·automatic. The DSO code
consining 01 two numbers designates the
distriCt in whi ch the car wu ordered and
may appear in conj uncti on with a Dom·
estic Special Order or Foreign S~cial
Order number when applicable. Ford 01
Canada DSO codes consist of a letter and
a number except for export codes which
are designated by two numbers.
MODEL YEAR CO DE
The number 0 designates 1970.
MADE IN
G) CONSEC'.'TIVE UN;T NO
CD
o
o
o
CD
1l00T SUhA l CODE
MCVEL HAil (OOE
,l, SS EMBL ~ <'LA NT
coo£
ENG INE COOt
TRIM (OOf
OffiCIAL VEH ICLE
IDENT IFICATIO N NUMBE R
The official Vehicle Identification Number (VIN) for ti tle and registrati on pu rposes is stamped on an aluminum tab
thaI is riveted 10 Inc instrument pancl
close to the windsllield on Ihe driver's
side of the tar a nd is visible from outside
(Fig. I).
u.s .....
CD
o
o
®
®
ASSEMBLY PLANT CODES
!IUd? .>,XlE (DOE
c...
Letler
(OLOil CODE
Atlanta
SOOT HPt: Coo{
A...•••••.•..••••••..••••
O:STRICT
C........................ Ontario t ruck
SPEC EQUIP CODE
B..•••...........
Oabille (Canida)
o
Dallas
G.............
Dearborn
Chicago
H.•
lo ra in
E
f .................... ..
TII ANSMI SS:ON CODE
w 100'1 ...
VEHICLE CE RTIFICATION LABEL
The Vehicle Ce rtifica tion Label (V ,C.
Label) is attached to the rear fa ce of the
driver' s door. The uppe r half of the label
contains the name of the manufacturer,
the month and year of manufacture and
the certificatio n statement. The V.C. label
also contains the Vehicle Identifi calion
Number. This number is also used lor
I ................. .
Mahwah
Los Angtles
II ....................... KanSlrs City
l ....................... Michie.n truck
N ........................ Norfolk
P........................ . Twin Cities
San JoSt
S......................... Allen Park
T....................... .. Metuchen
louisyille
U .•
lIenhlcky Truck
V..........
W....................... . Wayne
X......................... SI. Thomas
R.......... .
y ......................... Wixom
St.louis
Z........ ..
C1I24Ss.A
30-01-02
Identification
30-01-02
DATE CODES
A number signifying the date preceeds
the month code letter. A second-year code
letter will be used if the model exceeds 12
months.
Month
Code
First Year
January ..................
February ............... .
March ....................
April ......................
May .......................
June .......................
July ........................
August ...................
September ........... ..
October .................
November ..............
December ............ ..
Code
Second
Year
A.................... N
B .................... P
C .................... Q
0 .................. . R
E .................... S
F .................... T
G .................... U
H ...................
V
J .................... W
K.................... X
l .................... Y
M ................... Z
DISTRICT CODES (DSO)
Units built on a Domestic Special Order, Foreign Special Order, or other Spe·
cial orders will have the completc order
.number in this space. Also to appear in
this space is the two-digit code number of
the District which ordered the unit. If the
unit is a regular production unit, only the
District code number will appear.
CONSECUTIVE UNIT NUMBER
Starting Serial Numbers-1970 Passenger
Cars
100,001 - Ford, Fairlane, Falcon, Mustang, Thunderbird, Maverick
500,001 - Mercury. Meteor, Montego.
Cougar
800,001 - Lincoln Continental & Mark
LlNCOlN·MERCURY
FORD
Code
Code
District
11......................
13......................
15......................
16......................
17......................
21 .......................
22......................
24......................
25......................
28......................
32......................
33 ........ ;;............
35......................
37......................
38......................
41 ................. h...
43......................
44......................
46......................
47......................
51......................
53......................
54......................
55......................
56......................
61......................
62......................
63......................
64......................
65......................
71 ......................
72 ......................
73......................
74......................
75......................
83......................
84......................
85......................
89......................
90·99.................
Boston
New York
Newark
Philadelphia
Washington
Atlanta
Charlotte
Jacksonville
Richmond
louisville
Cleveland
Detroit
lansing
Buffalo
Pittsburgh
Chicago
Milwaukee
Twin Cities
Indianapolis
Cincinnati
Denver
Kansas City
Omaha
St.louis
Davenport
Dallas
Houston
Memphis
New Orleans
Oklahoma City
los Angeles
San Jose
Salt lake City
Seattle
Phoenix
Government
Home Office Reserve
American Red Cross
Transportation Services
Export
District
11....................... Boston
15...................... New York
16...................... Philadelphia
17 ...................... Washington
21...................... Altanta
22...................... Dallas
23...................... Jacksonville
26...................... Memphis
31...................... Buffalo
32...................... Cincinnati
33..................... Cleveland
34...................... Detroit
41 ...................... Chicago
42...................... St.louis
46...................... Twin Cities
51....................... Denver
52 ......~............... los Angeles
53....................... Oakland
54...................... Seattle
84 ......................Home Office Reserve
90...................... Export
FORD OF CANADA
Code
District
Bl .....................
B2......................
B3.......................
II th ru I7 ..........
B4 .................;....
B6......................
B7......................
Central
Eastern
Atlantic
Export
Midwestern
Western
Pacific
Note: Canadian lincoln·Mercury units use prefix
"A" in place of "B"
III
RADIO IDENTI FICATION
SAMPLE NUMBER
DODA
1
Year
-.
Car line
MANUFACTURER CODE NUMBER
125
185
1260
Bendix
Motorola
Philco
BASIC NUMBER AND TYPE RADIO
18806
1911241
1911242
1911243
1911244
1911237
AM RadiO
AM/FM Multiplex
AM Radio/Stereo Tape Player
AM-Oual Channel Stereo
AM Signal Seeking Radio
Stereo Tape Player Deck
18806
t
Type
B
o
260
t
Design level
~
t
Manuf act ur'er
Year
11
-.
Week
IDENTIFICATION NUMBER
Number
Car Line
~
C9M
C9ZA
DOM
DODA
DOGA
DOlA
DOMA
DOOA
DOSA
DOVA
DOWA
DOYA
DOZA
Ford and Meteor
Mustang and Cougar
For d and Meteor
Maverick
Cougar
Continental Mark III
Mercury
Fairlane and Montego
Thunderbird
lincoln Continental
Cougar
Meteor
Mustang
CK2456·A
31-01 -0 1
31-01 -01
GROUP
stem
31
PAGE
PART 31 -01
General Charging System Service ......31 ~ O 1-01
PART 31 -02
Autolite Alternators ....................... .... 31 -02-01
PART 31 -03
Autolite Alternator Regulators ...... .... . 31-03-01
PAGE
PART 31 -04
leece·Nevi lle Alternators ........... ....... 31 -04-01
PART 31 -05
leece-Nevi lle Alternator Regulators .. 31-05-01
PART 31 -06
Batteries ....... ........................... ..........31 -06-01
PART 31-01 General Charging System Service
The alternator and alternator regulator are precision built un its, and the
equipment to make tests in the charging system must be accurate . Volt·
meters must be accurate with in 0, 1
(one tenth) volt within the range or 12
to 16 volts and am meters within one
ampere at 30 to 65 a mperes to perm it
correct measurement of the alternator
and regulator. The meters on Rotunda equipment should be calibrated
once a year a nd the date of calibration stamped o n the me ter face . 11 is
recommended that this practice be
fo llowed by technicia ns with other
than approved equ ipme nt in order to
maintain their me ters at accepta ble
accuracy.
Certain tests o utlined in this section
are illustrated in schematic a nd in
pictoria l form . The schematic illustra tes the internal connections of the
Rotunda equipme nt so that these connections can be duplica ted when this
equipme nt is not avai la ble. The Rotunda test units a re a combinati on of
accepted instruments incorpora ted
into a si ngle unit. The vario us circuits
involved in the tests can be se lected
by means of switches without t he necessity of changing connections. As a
result. the time requi red to test units
and circ uits on the vehicle is reduced.
Where a pplicable. the tests a re divided in to On The Vehicle and On
The Test Bench procedures. Either
procedure ca n be followed depending
on the equipment available fo r the
tests.
Trouble shooting o r diagnosis is re-
quired before actual repairs a re made
in the electrical system . Even where
an obvious fau lt makes the replaceme nt of a unit necessary. yo u must
still find out wh y the unit fai led. The
trouble Shooting proced ures given in
th e Electrical System s Di ag nosis
Ma nual will aid you in mak ing a correct diagnosis. When a trouble is
diagnosed correctl y. unnecessary repairs a re prevented . the time the vehicle is out of service will be dec reased.
and the re pai rs that are made will be
permanent .
Schematic wiring diagra ms (Figs.
1.2 and 3 Parts 31-02 a nd 03) of the
chargi ne circuits show the internal
connections a nd windings of the va rio us uni ts. Color codes a re shown to
aid in traci ng the circuit.
31-02-01
31-02-01
Autolite Alternators
PART 31-02 Autolite Alternatflrs
COMPONENT INDEX
Applies to Models
As Indicated
ADJUSTMENT-BELT, ALL MODELS
DESCRIPTION AND OPERATION
All Alternators
Fuse Link
DISASSEMBLY ANDOVERHAUL
38-Ampere Alternator
42-Ampere Alternator
55-Ampere Alternator
55-Ampere Alternator With Integral
Voltage Regulator
65-Ampere Alternator
REMOVAL AND INSTALLATION
All Alternators
Fuse Link
SPECIFICATIONS
TESTING
Fuse Link
With Rotunda (ARE 20-22) Tester
With Rotunda (ARE 27-38) Tester
Diode Test
Field Open or Short Circuit Test
Stator Open or Grounded Circuit Tests
Stator Neutral Voltage Test
Output Test
. . ,. ..
. .
.;
III
'ii
~
1
~
~
"a
CI
;(
"'"
~
G/
~
G/
I:
CI
~
G/
~
~
"C
CI
U
"'"
.. ...
.III
..
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I:
CI
~
~
·cG/
CI
DII
I:
c:
III
~
~
.:
G/
•ell
CI
~
~
DII
~
_
....
c:
=
c:
II:
CI .::
CI
...lU
.. ...
-"f
.:: -
"a
:s
..!.
I:
~
G/
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I:
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.c:
~
I:
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~~
02-10.
.
02-01
02-16
N/A N/A N/A N/A 02-11 02-11 02-11 02-11 02-11
02-11 02-11 02-11 02-11 02-11 02-11 02-11 02-11 02-11
02-11 02-11 02-11 02-11 02-11 N/A N/A 02-11 02-11
N/A N/A N/A
N/A N/A N/A
N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A 02-11 02-11 02-11
N/A N/A N/A N/A N/A N/A N/A 02-14 02-14 02-14
02-14 02-14
02-10
02-16
02-17
02-16
02-02
02-03
02-09
02-08
02-09
02-07
02-03
A page number indicates that the item is for the vehicle listed at the head of the column.
N / A indicates that the item is not applicable to the vehicle li,sted.
1
ACCESSORY
TERMINAl
DESCRIP'nON AND
OPERATION
The alternator charging system is a
negative (-) ground system, and consists of an alternator, a regulator, a
charge indicator, a storage battery
and associated wiring. Refer to Wiring Diagram Manual Form 7795-P-70
for schematics and locations of wiring
harnesses.
ALTERNATOR
The alternator is belt driven from
the engine. CUrrent is supplied from.
the alternator-regulator system to the \'
rotating field of the alternator
through two brushes to two slip rings ..
The alternator produces power in
the form of alternating current. The
alternating current is rectified to direct current by six diodes for use in
charging the battery and supplying
power to the electrical system. The
alternator is self current limiting.
Figs. I, 2 and 3 show the alternator
.
system schematics.
GRE~RED
STRJPE
AlTERNATOR
OUTPUT TERMINAl
DIODE RECTIFIERS
s
F
":' 5 LI PRINGS
FIG. l-Autolite Alternator System-Indicator Light
J1210-H
31-02-02
,------,
BATTERY TERMINAL
OF STARTER RELAY
.rl---I
~
31';02-02
Autolite Alternators
NOT USED
WIT H AMMETER
IAnERY
~
USED WITH
SHUNT TYPE
A~EnR
I
I
004 OHMS
I
I
I
I
I
I
I
A+
I
S
I
I
I
I
I
I
GREEN-RED
STRIPE
F
I
I
I
I
-=-
I
L
REGULATOR
------
J
JI20S,G
FIG. 2-Autolite Alternator System-Ammeter
SHUNT
r-------
A~ETER
IGNITION SWITCH
TO OTHER CIRCUITS
+--......~,... . - - - ,
+
NEGA TIVE DIODE
FIELD COIL
-=-12.VOLT
-=-BATTERY
~
GREEN·
RED STRIPE
RADIO
SUPPRESSION
CAPACITOR
SLlP.RINGS
BLACK· RED STRIPE
ALTERNATOR
JI«I9·B
FIG. 3-Autolite Alternator System-With Integral Regulator
2
AUTOLITE ALTERNATOR TESTING
\
Refer to the Ford Car and Truck
Diagnosis Manual for diagnosjs of the
Autolite alternator system.
Check the alternator drive belt and
adjust it to specification (Section 7 in
this part), before proceeding witll any
tests. Check and tighten all COMectors at the starter relay and battery.
31-02-03
Autolite Alternators
31-02-03
,.
[ IGN·]t 'AT. J["ATO'] [ 'IElD ][ REGJ
GREEN
GREEN
.
[
GREEN
GREEN
GREEN
r
0100, ] ]
SHORT ]
RED
INDICATOR LAMP
RED
~ REG. J
o
RED
CIRCUIT SELECTOR.:..;Hi-:=:---------_f{!
SWITCH
o
AMMETER
CONNECT TO REGULATOR
CONNECT TO REGULATOR
MOUNTING SCREW
FOR USE WITH AMMETER
TYPE CIRCUITS
J 1398·"
FIG. 4-ARE 20-22 Tester
TESTS USING THE ROTUNDA
ARE 20~22 ALTERNATOR
REGULATOR TESTER
The general procedure is to connect
the tester (Fig. 4), to the charging
system, start the engine, make two
tests, and then compare the pattern of
lights that appear on the· tester to
each set of patterns shown on two
charts (Figs. 5 and 6). Follow the instructions. given with the ARE 20-22
tester. The ARE 20-22 tester cannot
be used to test the alternator with the
integral regulator.
TESTS USING THE ROTUNDA
ARE 27-38 VOLT-AMPALTERNATOR TESTER
The following test procedures make
use o'f the Rotunda Volt AmpAlternatoJ Te'ster ARE 27-38.
Refer to Wiring Diagram Manual
Form 7795-P-70 for schematics and
locations of wiring harnesses. Use
care when connecting any test equipment to the alternator system, as the
alternator output terminal. is connected to the battery at all times.
ALTERNATOR OUTPUT
TEST ON ENGINE
When the alternator output test is
conducted orf the car, a test bench
must be used. Follow the procedure
given by. the test bench equipment
manufacturer. When the alternator is
removed from the vehicle for this purpose always disconnect the battery
ground cable as the alternator output
connector is connected to the battery
at all times.
To test the output of the alternator
on the vehicle, proceed as follows:
Alternators Without An Integral
Regulator
I. Check the alternator drive belt
tension. Place the transmission in
neutral or park and apply the parking
brake. Make the connections and
tester knob adjustments as shown in
Fig. 7 Output Test. Be sure that the
field rheostat knob is at the OFF position at the start of this test.
2. Close the battery adapter switch.
Start the engine, then open the bat"
tery adapter switch.
3. Increase the engine speed to approximately 2000 rpm (use a tachom-
1965/72
FORD CAR
FINAL ISSUE
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FINAL ISSUE
May, 1975
COPYRIGHT 1975 --
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P-5394
HOW TO READ
WIRING
DIAGRAMS
VOL 68 S7 L2A
HOW TO READ
WIRING DIAGRAMS
COURSE 13001 • VOL. 68 57 L2A
TABLE OF CONTENTS
Page
INTRODUCTION
1
A LOGICAL APPROACH TO ELECTRICAL DIAGNOSIS.
2
Like reading a road map . . . . . . . . . . . . . . . .
How wires are numbered and color - coded. . . . . .
2
5
CIRCUIT - A COMPLETE ELECTRICAL PATH BETWEEN TWO POINTS
2 - wire circuit. . . . .
Single wire circuit . .
Ground connections.
6
6
7
OPEN CIRCUITS
8
Shorts ..
Grounded circuit. .
Series and parallel open circuits
9
9
10
BREAKS IN PARALLEL CIRCUITS .
11
Common points . . . . . . .
Splices . . . . . . . . . . . . . .
Fuses and circuit breakers. . .
Quick disconnects . . . . . .
Male and female elements .
Types of quick disconnects.
14
15
17
18
20
22
23
HINTS FOR TRACING WIRES THROUGH A DRAWING
Curve directions .. . . . . . . .
Common points
Switches ..
Relays . . . . . .
Assemblies . . .
Locating the assembly
Finding the wire .
23
24
25
26
28
29
30
31
SUMMARY . . . . . . . . .
The descriptions, testing procedures, and specifications in this handbook were
in effect at the time the handbook was approved for printing. Ford Motor Com-
NATIONAL SERVICE OFFICE
FORD DIVISION
eM.
pony reserves the right to discontinue models at any time, or change specifications, deSign, or testing procedures without notice and without incurring
obligations.
FIRST PRINTING - JANUARY, 1968
©
1968 FORD MOTOR COMPANY
DEARBORN. MICHIGAN
INTRODUCTION
The Why and Wherefore of Wiring Diagrams
To the uninformed, a wiring diagram looks like it might take a genius to figure out.
or a wiring assembly-
Not so - as you'll find out when you get better acquainted with
these subjects.
There're as understandable and logical as a road map and road
markers, when you're finding your way on a cross-country drive.
The ability to read a wiring diagram and relate it to a vehicle's
wiring system is, of course, an essential part of a modern service technician's skill. And it's growing in relative importance, too, due to
owner's increasing demands for the comforts and conveniences supplied
by electrically - operated options and accessories. This opens up greater
opportunities, for the forward-looking technician.
The Purpose of this Booklet . ..
. . . is to acquaint you with the systems by which electrical circuits are
traced on vehicles. Specifically, it is designed to help you acquire the
ability to make your own power checks, quickly and accurately.
Scope of the Booklet
Basically, this is a printed version of the film, "How to Read a
Wiring Diagram." It is in no sense a manual of the shop methods by
which electrical repairs are made.
It can be a helpful guide that can introduce you to the principles of
wiring diagrams and vehicle wiring. As you gain experience in reading
wiring diagrams, you'll accumulate your own know-how in this important skill. When it becomes" second nature" to you, these pages will
have served their purpose - and yours.
To show how to read wiring diagrams - and
to explain how they can be used to h elp you
troubleshoot problems in the electrical system is what this booklet is all about. Obviously, these
are important subjects.
A LOGICAL APPROACH TO
ELECTRICAL DIAGNOSIS
I~-
-.
-~-
0~--
•
When you go to a doctor, for example, he tries
to find out what' s really wrong with you. He looks
beyond the aches and pains you fee l, to see wh at' s
causing the trouble. We call this, diagnosis.
. IT a customer comes in because his beadlights
a ren' t working, you can't just make a snap decision. That's not the professional way.
1~
Putting in a new sealed- beam u nit may be the
answer . . . b u t then again, it may not. Snap
decisions are out. They're not professional.
Troub leshooting an electrical system calls for
diagnosis, too - Your diagnosis. You're the
doctor. You must find out what's causing the
trouble, and fix it.
I
LOGICAL
APPROACH
The easiest way is to begin with a logical ap proach - you check things out. You find out
what parts of the electrical system are still work ing okay. You Darrow it down to one part - ODe
wire - one switch.
-)
Sure, you may feel a little confused when you
face a jumble of wires for the first time. But there's
a way to make sense out of this. There is a logical
approach.
..
..... " .....~
, I~
:)' r.;'j' ~tt
I
•
if
(
111
p o.
LIKE READING A ROAD MAP
,
.. ,./
'~.
•
,.
"
'-#
l
1
.,;.. "-'¥r
1. -
.•,;~
•
..... .
rtl-"
~ ••J
••
Reading a wiring diagram is something like
reading a road map. The map shows routes that
connect one place with another . .. and a diagram
shows routes, too. The lines represent actual wires,
a nd these wires are identified by numbers . . .
much like highways are identified by number.
HOW WIRES ARE NUMBERED AND
COLOR - CODED
12
UA'
" ~ I ""
.......,"(>'
..,u_
lilt
~
US
It s tarts with a diagram that shows all elec-
trical parts - switches, wires, splices, connections,
the battery - everything you need to know.
2
\\Then you want to locate a specific highway,
you check the number on the map with a number
on a highw ay sign. U's almost that easy with
wires a nd wiring numbers.
~[
"~
}'WIT""
tltlC
eR~ ,, ~~ Y
~*
J
1 "...
".- -
OJ.
~
ee
l
IHl
You find the number you want o n the wiring
diagram.
Here's the wire you're looking for. This wire is
an electrical path, a path that goes from one
specific place to another.
WIRING COLOR CODE
BASIC
COLOR
STRIPE
ORANGE
GREEN
BLACK
GREEN
RED
RED
YELLOW
BLACK
RED
ORANGE
BLACK
BLAC K
YELLOW
VIOLET
BLACK
RED
WIRE
NUMBER
8, 447
10,10A,443
1l,llA
12, 12A, 12B,
12C
13, 13A I
8
14,57 THRU
57H, 48, 48A
77 ,44 1,441A
140,140A,
140B
Then you find the number o n the wiring color
code. It tells you what color the w ire should be.
You try to follow the wire, but it soon disappears into a bundle of wires that's tightly bound
with black tape. How do you find out where it
goes from here?
3