Shift interlock circuit, motorhome chassis for GMC Rally G2500 (1985-1995)

BACKUP LAMP SWITCH BLK WIRE BRAKE SHIFT INTERLOCK RELAY (ON STEERING COLUMN) BRAKE/TRANSMISSION SHIFT INTERLOCK SOLENOID (ON STEERING COLUMN) CLOSED IN PARK DK BLU WIRE DK GRN/WHT WIRE FUSE BLOCK HOT IN ACC OR RUN HOT IN START OR RUN FUSE BLOCK TRANS FUSE PNK/BLK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF VEHICLE, BEHIND SHIPPING PANEL) PPL PPL PPL TCC/ BRAKE SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TURN SIGNAL FLASHER (ON FUSE BLOCK) TURN-B/U FUSE