Ford Econoline E150 (1997-2012) Back-up lamps circuit, without stripped chassis

BLK WIRE BLK/PNK WIRE CENTRAL JUNCTION BOX (BELOW LEFT SIDE OF DASH) DIGITAL TRANSMISSION RANGE (DTR) SENSOR (ON LEFT SIDE OF TRANSMISSION) EXTERIOR LIGHTS (TRAILER BACKUP LAMP RELAY) FUSE 12 HOT IN RUN LEFT REVERSING LAMP RIGHT REVERSING LAMP WHT/VIO WIRE