7.4l (vin n), data link connector circuit for GMC Cab & Chassis C2500 (1989-2000)

BLK/WHT WIRE DATA LINK CONNECTOR DIAGNOSTIC REQUEST DIAGNOSTIC TEST FOUR-WHEEL ANTI-LOCK BRAKE MODULE (NEAR MASTER CYLINDER) FUEL PUMP FUEL PUMP PRIME FUEL PUMP RELAY GRY WIRE ORG/ WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT END OF I/P) RED WIRE SERIAL DATA TAN/WHT WIRE WHT/BLK WIRE