6-72
Name Circuits/Circuit Breakers Protected
HEAD LAMP Headlamps, Daytime
Running Lamps
AUX WRG Auxiliary, Parking Brake
IGN SW1 Ignition Switch, Wash/Wipe,
Crank, Radio
HYD PUMP Hydraulic Brake, Brake Pump Motor
HYD ABS Hydraulic ABS
AIR ABS Air ABS, ABS Power Relay,
Trailer Wiring
PWR
WDO/LCKS
Window, Door Locks
PARK BRK Parking Brake Motor
TRLR Trailer
BLOWER
HORN
Blower, Horn, Cigarette
Lighter/Auxiliary
TRANS/
ENGINE
Ignition Coils, Fuel Injectors
(Gasoline Engines), Transmission
Control Module (Diesel Engines),
Engine Controls
Replacement Bulbs
It is recommended that you use an AC
R
type bulb
whenever you need to replace one.
Before you replace any bulbs, be sure that all lamps are
off and the engine isn’t running.
Capacities and Specifications
Replacement part numbers listed in this section are
based on the latest information available at the time of
printing. They are subject to later change. If a part listed
here isn’t the same as the part in your vehicle when it
was built, or if you have any questions, please contact
your GM Truck dealer.
Engine Identification and Data
Engine RPO LG5 L18
Engine Type 7.2L L6 8.1L V8
Fuel System HEUI SPFI
Firing Order
1
-5-3-6-2-41-8-7-2-6-5-4-3
Wheel Nut Torque
Refer to “Tightening the Wheel Nuts” in this section for
wheel nut torque information.
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