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WIRING
DIAGRAMS
8W - 3 fer to a components name in the index if you are
unclear as to what a system may be called.
Diagram pages are arranged starting with the bat
tery and fuses. Then working into charging, starting, and ignition systems. After this they start at the
front of the vehicle and work to rear of the vehicle.
The diagrams end with connector identification
pages.
COMPONENT
IDENTIFICATION
To find a components actual location on the vehicle
refer to the wiring and components section index. This section shows the wire harness routing and the compo
nents location in the vehicle. When using this section
refer to the wiring diagrams for the general location of
the component. Then use the component identification index to locate the proper figure number.
SPLICE
LOCATIONS
Splices are indicated in the wiring diagrams by a
diamond with splice circuit code within it (Fig. 5 ex ample 1). If there is more than one splice per circuit
splice code a small box will be connected to the dia
mond with the splice number in it (Fig. 5 example 2). To locate a splice in the wire harness determine
the splice number from the wiring diagrams, then re
fer to the splice location index. This section shows
the general location of the splice in the harness.
EXAMPLE
1
EXAMPLE
2 918W-18
Fig.
5 Wiring
Splice
Examples
CONNECTORS
The connectors shown in the diagram are viewed from
the terminal end unless otherwise specified. For view ing bulkhead and engine controller connectors refer to
the back of the wiring diagrams. This area shows major connectors for pin and cavity identification.
TROUBLESHOOTING
WIRING
PROBLEMS
When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
are listed and explained below. (1) Verify the problem.
(2) Verify any related symptoms. Perform opera
tional checks on components in the same circuit as the problem area. Refer to the wiring diagram fuse
application chart for circuit information. (3) Analyze the symptoms. Use the wiring dia
grams to determine what the circuit is doing, where
the problem most likely is occurring and where the diagnosis will continue. (4) Isolate the problem area. (5) Repair the problem.
(6) Verify proper operation. For this step check for
proper operation of all items on the circuit repaired. Refer to the wiring diagram fuse application chart.
FUSIBLE
LINKS
Vehicle wiring harnesses are equipped with fusible
links.
For protection against harness damage in the
event of a short. Fusible links are color coded as to
wire gauge size. Refer to the fusible link chart for color and gauge identification (Fig. 6).
Wire and
Gauge
Color
Code
Color
12 Ga.
BK
Black
14 Ga.
RD
Red
16 Ga.
DB
Dark
Blue
18 Ga.
GY
Gray
20 Ga.
OR
Orange
22 Ga.
WT
White
918W-19
Fig.
6 Fusible
Link
Chart
HARNESS
REPAIR
FUSIBLE
LINK
REPLACEMENT
CAUTION:
Do not replace blown fusible
links
with
a
standard
wire.
Only
use fusible type
wire
with
hyp-
alon
insulation or
damage
to the electrical
system
could
occur.
Also
make
sure
correct
gauge
of
wir
ing
is
used.
Refer to the wiring
diagrams
for proper
gauge
and
color.
When a fusible link blows it is important to find
out what the problem is. They are placed in the elec
trical system for protection against shorts to ground
that can be caused by a component or various wiring
failures. Do not just replace the fusible link to correct the problem.
When diagnosing a faulty fusible link it is impor
tant to check the wire carefully. In some instances
the link may be blown and it will not show through the insulation, the wire should be checked over its
entire length for internal breaks.
(1) Disconnect battery negative cable.
(2) Cut out the blown portion of the fusible link.
(3) Strip 1 inch of insulation from each end of the
existing fusible link.
(4) Place a piece of heat shrink tubing over one
side of the fusible link. Make sure the tubing will be
long enough to cover and seal the entire repair area.
(5) Cut a replacement piece of fusible link approx
imately two inches longer than the piece removed. (6) Remove one inch of insulation from each end of
the replacement fusible link.
