GMC C-Series 2001 Owner's Manual page 273

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).
-
Be sure to replace maxi fuses with maxi
same rating. Do not use maxi
than those indicated on the maxi
Vehicles with Hydraulic Brakes
-
fuses of the
-
fuses of higher amperage
-
fuse block.
Vehicles with Air Brakes
Name Circuits/Circuit Breakers Protected
STP/HAZ Stoplamp, Turn Signal/Hazard
TURN Lights, Fuel
IGN SW3 Air Conditioner, Ignition Switch,
Axle, Chassis, Ignition Relay
INT/EXT Parking Lamps, Dome/Panel Lights,
LIGHTS Marker Lamps
6-71