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Troubleshooting Trailer Wiring Where Running Lights are Always On  

Question:

Hi, I have a stock horse trailer WW brand, 1995. Last year I rewired the trailer and everything worked fine. Now, when I plug the trailer into the truck, the running lights on the trailer and truck come on, even with the truck is turned off. Where should I start?

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Expert Reply:

Sounds like the trailer wiring harness of your vehicle shorted out and is now damaged. I would first check the trailer connector on the vehicle for obvious shorts or exposed wire and fix as needed as it could be just a simple short. Once you do that you'd need to go over the trailer's wiring looking for any cut or exposed wire that could be shorting out and fix as needed.

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Jameson C

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