GMC Cab & Chassis C3500 (1985-2000) Defogger circuit

BLK WIRE BRN WIRE CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) FUSE/RELAY BLOCK (LEFT REAR OF ENGINE COMPT) HEATED MIRROR RELAY (BEHIND LEFT SIDE OF DASH, ABOVE SUPPORT BRACKET) HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL MODULE (IN CENTER OF DASH) I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) LEFT CARGO DOOR CONTACTOR LEFT HEATED MIRROR LEFT POWER OUTSIDE REAR VIEW MIRROR LEFT REAR CARGO DOOR DEFOGGER GRID MIRRORS FUSE ORG/ WIRE PICK-UP W/ EXTENDED OR CREW CAB PPL REAR WINDOW DEFOGGER GRID REAR WINDOW DEFOGGER SWITCH RIGHT CARGO DOOR CONTACTOR RIGHT HEATED MIRROR RIGHT REAR CARGO DOOR DEFOGGER GRID RR DEFOG FUSE SOLID STATE TIME DELAY RELAY SUBURBAN/UTILITY W/ LIFTGATE SUBURBAN/UTILITY W/O LIFTGATE W/ HEATED MIRRORS