GMC Rally G2500 (1985-1995) 6.5l (vin p), data link connector circuit

BLK WIRE BLK/WHT WIRE DATA LINK CONNECTOR DIAGNOSTIC REQUEST DIAGNOSTIC TEST FOUR-WHEEL ANTI- LOCK BRAKE MODULE (UNDER RIGHT SIDE OF VEHICLE, AT FRAME RAIL) FUEL PUMP FUEL PUMP PRIME FUEL PUMP RELAY GRY WIRE ORG/ WIRE POWERTRAIN CONTROL MODULE (BEHIND RIGHT KICK PANEL) RED WIRE SERIAL DATA WHT WIRE WHT/BLK WIRE