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Troubleshooting Trailer Wiring that Causes Vehicle Running Lights to Come On  

Question:

When I hook my horse trailer up to my 2014 Dodge Ram 3500 my cab and fender lights come on but no lights on my trailer work

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Expert Reply:

Sounds like your trailer's wiring needs to be cleaned up or is wired incorrectly. I attached a diagram that shows how a 6-way harness that would commonly be installed on a horse trailer would get wired.

Sometimes the brake output and 12 volt power circuits get swapped so you may want to test the center pin of your truck 6-way first. If there is voltage there then the trailer should be wire up just like the diagram.

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Jameson C
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