Manual transfer case circuit, with heavy duty transmission for GMC Cab & Chassis K2500 (1989-2000)

A/T ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE DIESEL FROM ABS CONTROL MODULE) FRONT AXLE ACTUATOR FUSE 24 GASOLINE GRY WIRE GRY/BLK WIRE HEAVY-DUTY TRANSFER CASE HOT IN PARK OR HEAD HOT IN RUN I/P FUSE BLOCK (LEFT SIDE OF DASH, ILLUM FUSE 14 INDICATOR INTERIOR LIGHTS SYSTEM (SUBURBAN W/ A/C ONLY) LT BLU WIRE LT N/A M/T POWERTRAIN CONTROL MODULE (DIESEL) RED WIRE SEAT BELT SWITCH TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP TRANSFER CASE RELAY (RIGHT SIDE OF FIREWALL) TRANSFER CASE SWITCH (TOP LEFT OF TRANSFER CASE) TRANSFER CASE SYNCHRONIZER (TOP OF TRANSFER CASE) VEHICLE CONTROL MODULE (GASOLINE) (LEFT SIDE OF ENGINE COMPT) WHT WIRE