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Troubleshooting Only Running Lights Work When Trailer Hooked to Truck  

Question:

HOOK UP MY TRAILER TO ANOTHER TRUCK AND THE LIGHTS WORKED FINE. MY TRUCK LIGHTS ARE WORKING PROPERLY BUT WHEN I HOOK IT UP TO THE TRAILER ONLY THE RUNNING LIGHTS WORK. WHERE SHOULD I LOOK FOR A PROBLEM?

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Expert Reply:

Since the lights work with a different truck the problem is on your truck. Check the connection for debris or corrosion and clean as necessary. After that, I would start testing for power with a circuit tester like # PTW2993. Try testing right behind the connector and work your way back to see if you can find a short. You should also make sure your ground connection is secure.

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Robin H

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