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Troubleshooting 6-Way to 7-Way Wiring on Horse Trailer

Question:

I’m trying to wire up a 7 blade trailer plug to our horse trailer. We have 6 wires brown, black, red, yellow, white, and green. We are trying to determine the wiring diagram and why the electric breaks aren’t working. Any suggestions?

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Expert Reply:

Based on the colors you have it sounds like your 6-way wiring is similar to the Hopkins 6-Way Connector with Jacketed Cable - Trailer End - 8' Long # H20036. In this instance the red wire is going to be your brake power. On a typical 7-way the blue wire would be the brake power/brake controller wire.

Realistically since there is no wiring standard I would recommend tracing your wire back to the brakes or other functions to make sure you have the wires installed correctly on your 7-way connector. Once you know you have the right wire you should find that the brakes work or be able to determine if there is a different issue. If you are still having trouble with your brakes feel free to reach out and I can help you troubleshoot further.

I have attached some different help articles on wiring that cover both 6-way and 7-way wiring.

expert reply by:
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Robin H

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