GMC Forward Control P3500 (1985-1999) Interior light circuit, cutaway chassis

BLK WIRE BRN WIRE DK GRN WIRE FRONT DOME LAMP FUSE BLOCK- I/P FUSE BLOCK: I/P INSTR LPS FUSE GRY WIRE HEAD- LIGHT SWITCH DOME SWITCH HEADLIGHT SWITCH HIGH DIM HORN/DM FUSE HOT AT ALL TIMES I/P DIMMER SWITCH INSTRUMENT CLUSTER LEFT DOOR JAMB SWITCH LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PROVISIONS FOR REAR DOME LAMP RADIO SOLID STATE TAIL LPS FUSE TRANS- MISSION RANGE INDICATOR LAMP HEATER CONTROL LAMP WHT WIRE