How to Determine Which Wires Correspond to What Function on Hopkins Endurance 7-Way HM42190

Question:

Plug where 7-Way Trailer Connector plugs into veh harness, rectangular connector by rear bumper feeds 7-way trailer connector, need wire diag for this rectangular connector purple wire, red wire, some black wires with w traces

asked by: Butch

Expert Reply:

If you're trying to find the wiring functions on the Hopkins Endurance # HM42190, I've attached a wiring diagram for a standard 7 way plug that should help you out. You'll be able to plug in and determine which wire is pinned to which port. Most of the time the wiring colors are not standard, so I can't confirm which color wires match what on a harness without testing for functions using a circuit tester like the # PTW2993

1-o'clock- 12v Power
3-o'clock- Right Turn Signal/Brake Light
5-o'clock- Brake Controller Output
7-o'clock- Ground
9-o'clock- Left Turn Signal/Brake Light
11-o'clock- Tail and Running lights
Center pin- Reverse lights

If you're trying to find the functions of the wiring on the vehicle, you will need to test those with a circuit tester to determine the function when a circuit is activated, since the color of the wire is not a reliable way to determine the function of a wire. I've also linked one of our helpful articles on 7 way wiring and a diagram of the plug for you to refer to on this.