Chevrolet Silverado 3500 (2002-2006) Back-up lamps circuit, with allison automatic transmission

ALLISON TRANSMISSION B/U LMP VLT BATTERY BLK WIRE BLUNT CUT (W/ CAMPER BODY CONTROL MODULE (BCM) (ON LOWER LEFT SIDE OF DASH, BELOW STEERING COLUMN) BRN WIRE COMPUTER DATA LINES SYSTEM DIESEL ENGINE CONTROL MODULE (AT LEFT FRONT OF ENGINE COMPT) FUSE GRN WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES I/P FUSE BLOCK (ON LOWER LEFT SIDE OF DASH) I/P RELAY BLOCK (NEAR LEFT KICK PANEL) LEFT BACK-UP LAMP LT BACK-UP ALARM LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PRESS SW PRESSURE SWITCH MANIFOLD REAR LAMPS JUNCTION BLOCK REV SIG RIGHT BACK-UP LAMP SERIAL DATA TRAILER CONNECTOR TRAILER WIRING PROVISIONAL) TRANSMISSION CONTROL MODULE (AT LEFT FRONT OF ENGINE COMPT) TRLR B/U FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENG COMPT) YEL WIRE