Electrical Schematics Guide featuring Isolation Module and Relay System
Short summary:
Wiring Diagram 61185 Park or Turn Harness Kit .67. Electrical Legend and Wire Colors . Chevrolet/GMC, Dodge use a low. side drive headlamp system in which ...
Long summary:
Use the information in the Headlamp
Index to locate the electrical
schematic for the vehicle. All
headlamp harnesses are tagged with
the harness part number. The
schematic is an abstract drawing
showing the purpose of each
component in the system. Where
possible, component locations are
indicated by enclosures on the
schematic. The Lamp Type, Wire
Color and Connector Identification
charts and diagrams will give specific
wire colors, their function and
locations in connectors. Any special
notes are found in the upper right
corner of the schematic. Further
information and a specific
troubleshooting guide may be found in
the appropriate Mechanicâ s Guides.
The 9- and 12-pin Vehicle Side
schematics (relay system) contain all
vehicle headlamp and harness types.
The 7-pin Vehicle Side Schematics
show only a few representatives
applications. For other 7-pin vehicle
headlamp and harness types, refer to
the corresponding 9-pin Vehicle Side
schematic and use only the headlamp
circuitry. EARLY REVISION VEHICLE
HARNESSES (RELAY SYSTEM)
All 9- and 12-pin vehicle harnesses are
labeled with a white tag indicating the
harness part number and revision
level. Early 9-pin harness revisions 1-9
and 12-pin harness revisions 1-7 have
a ground circuit in which the control,
motor relay, and headlamp relays all
ground through the 9- or 12-pin
connector. Some of these early
revision harnesses also have a diode
in the ground wire to the headlamp
relays. Complete 9- and 12-pin
system schematics showing this early
revision ground configuration are
included in the relay section of the
book. These schematics are for early
revision harnesses using only the
solenoid control. If a hand-held control
has been installed, the ground circuit
has been modified into the later
revision configuration, in which only
the headlamp relays ground through
the 9- or 12-pin connector and the
control and motor relay ground
separately to the battery. Early
revision harnesses may be easily
identified by a single black/orange wire
on one of the motor relay primary
terminals which does not continue on
to the negative battery terminal. All
vehicle side schematics in this book
show only the later revision circuitry. GROUNDS AND COMMONS
Notice that â groundâ on the harness
connectors may be referred to as
â commonâ . Most domestic vehicles
use a high side drive headlamp
system in which power is supplied by
the switch to either headlamp. The
headlamps have a common
connection to ground. Some import
vehicles as well as 1999 to 2002
Chevrolet/GMC, Dodge use a low
side drive headlamp system in which
power is supplied to the common
connection of the headlamps. Ground
is supplied to either headlamp by the
switch.
Whether the terminal in the headlamp
harness is actually a negative ground
or a positive 12-volt common depends
on what type of vehicle headlamp
system it is installed into. Prior to the
publication of this book, all Western
Products electrical schematics
showed â groundâ whether or not it was
a true ground or a 12-volt common.
Some of these early schematics
appear in this book. Newer
schematics of low side drive systems
will show the more accurate term
â commonâ where appropriate.
Source: www.westernplows.com
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