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Is your trailer pig tail in the bed of your tow vehicle if so they tapped in to your wiring harness this is where I found the very same problem. I took apart there wiring job and redid the whole thing with a new 7 wire cord and new ends and the problem disappeared. I went to the factory plug in the rear of the truck and wired from there forward. But if you don't want to rewire just hook into the bumper plug I had a hole cut in my bed so I went with the rewire.
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