Ford Econoline E250 (1997-2012) Back-up lamps circuit, with stripped chassis

BATTERY JUNCTION BOX (LEFT FRONT OF ENGINE COMPT) BLK WIRE BLK/PNK WIRE CENTRAL JUNCTION BOX (BELOW LEFT SIDE OF DASH) DIGITAL TRANSMISSION RANGE (DTR) SENSOR (ON LEFT SIDE OF TRANSMISSION) FUSE 12 FUSE 14 HOT AT ALL TIMES HOT IN RUN LT GRN WIRE REVERSING ALARM (REAR OF VEHICLE) TRAILER LAMP FEED HARN, LEFT REAR OF VEHICLE TRAILER REVERSING TRAILER REVERSING LAMP RELAY W/ REVERSING ALARM W/O REVERSING ALARM WHT WIRE WHT/VIO WIRE YEL WIRE