Chevrolet 2008 T Series Owner's Manual page 234

Maxi-Fuse Block
When a fuse goes out, first check the instrument panel
fuse block. If there are no fuses out, the problem
could be in the maxi-fuse block.
The maxi-fuse block outside of the cab on the driver
side of the vehicle. To access the maxi-fuse block,
remove the four screws from the front of the box and
remove the cover.
Power is fed through these fuses to devices such as the
headlamp switch, ignition switch feed circuits and the
auxiliary brake pump (hydraulic brake vehicles).
Do not use maxi-fuses of higher amperage than those
indicated on the maxi-fuse block.
5-88
Fuses Usage
ST/TURN/HAZ Stoplamp, Turn Signals/Hazard
Warning Flashers
IGN SW 3 Air Conditioner, Axle, Chassis
INT/EXT Parking Lamps, Dome Lamp,
LIGHTS Instrument Panel Lights
Headlamps, Daytime Running
HEAD LAMP
Lamps
AUX WRG Auxiliary Wiring, Parking Brake
Ignition Switch, Washer/Wiper,
IGN SW 1
Crank, Radio
HYD PUMP Hydraulic Brake, Brake Pump Motor
ABS Antilock Brake System Module
ELECT TRANS Ignition Relay
PARK BRAKE Parking Brake Motor
BLOWER Blower, Horn, Cigarette Lighter,
HORN Auxiliary Outlets
TRAILER ABS Trailer Antilock Brake System,
Trailer Stoplamps
PWR
Power Window, Power Door Locks
WDO/LOCKS