GMC Forward Control P3500 (1985-1999) Warning system circuits, commercial chassis

BLK WIRE GAUGES FUSE 8 GRY WIRE HORN/DM FUSE 3 HOT AT ALL TIMES HOT IN RUN AND START HOT W/ PARK OR HEADLAMPS SWITCH ON I/P FUSE BLOCK INSTR LPS FUSE 16 INSTRUMENT CLUSTER LAMP ON INPUT GROUND POWER (BATTERY) SEAT BELT INPUT ORG/ WIRE PNK POWER (IGNITION) WIRE PNK WIRE SEAT BELT LAMP OUTPUT SEAT BELTS ALARM MODULE (AT THE BOTTOM OF THE I/P FUSE BLOCK) YEL WIRE