Semi Trailer Wiring Color Code - Hopkins Ford Chevy Gmc 7 Way Oem 7 And 4 Way Trailer Connector Kit 40955 Truck Ebay / When you're troubleshooting the trailer wires, be sure you do it one wire at a time, starting by checking your ground wire with a circuit tester.

Semi Trailer Wiring Color Code - Hopkins Ford Chevy Gmc 7 Way Oem 7 And 4 …