GMC Forward Control P3500 (1985-1999) Computer data lines, commercial chassis

3 2 PPL BLK WIRE DATA LINK CONNECTOR (DLC) (BELOW DASH, NEAR STEERING COLUMN) DIESEL GAS ELECTRONIC BRAKE CONTROL MODULE (EBCM) (BELOW RADIATOR, ON LOWER CROSSMEMBER) ENG BAT FUSE 10 HOT AT ALL TIMES I/P FUSE BLOCK ORG/ WIRE PPL PPL DATA CLSS 2 SERIAL DATA TAN WIRE TAN/WHT WIRE WHT/BLK WIRE