GMC 2000 Safari Owner's Manual page 320

Feed Usage
AUX B Upfitter Battery Feed
AUX A Upfitter Accessory Feed
Relay
AUX RR A/C Relay (Rear Heat and A/C)
-
Upfitter ACCY Relay
Starter Enable Relay
A/C Enable Relay
Headlamps Relay
Fuel Pump Relay
Fuse/Circuit
Breaker Usage
-
UPFITTER BATT Upfitter Battery Power Stud,
Trailer Wiring Harness
-
UPFITTER ACCY Upfitter Accessory Relay
Spare Not used
Fuse Puller*
Spare Not used
Spare Not used
6-65