Back-up lamps circuit, motor home chassis for GMC Vandura P3500 (1985-1997)

7.4L VIN N ALL EXCEPT 7.4L VIN N BRN WIRE DK GRN WIRE ENGINE GRN WIRE HOT IN I/P FUSE BLOCK LT GRN WIRE PARK/NEUTRAL POSITION (PNP), BACKUP LAMP SWITCH (LEFT SIDE OF TRANSMISSION) PROVISION FOR BACKUP LAMPS (ON LEFT FRAME RAIL NEAR REAR LAMP HARNESS) PROVISION FOR REAR MOUNTED CAMERA (NEAR BREAKOUT FOR STEERING COLUMN HARNESS) RUN WIRE TURN SIGNAL FLASHER (I/P FUSE BLOCK) TURN-B/U FUSE