At the age of your truck and trailer, I suspect as Daryles found that you have corrosion in your truck/trailer connection. Take the junction box cover off, make sure your ground and other wires are tight, then clean your trailer connection. It’s easy to get oxidation in there in ten years.
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Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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