I've had it occur a couple times, it's usually dirt and/or corrosion on the 7 pin connector - truck or trailer side. Try and clean it a little and put some dielectric on them to start
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2007 Rockwood 2701SS
2017 Ram 2500 Granite Crystal SAP Laramie 6.7L
2014 Triumph Bonneville. NH Togas, tuned
1953 GMC 9314
1982 GoldWing Interstate
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