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I had similar symptoms when I got my used truck and I traced it to connection /corrosion problems with my 7 pin connector.
The problem was not between the trailer 7 pin and the bumper mounted 7 pin receptacle, rather it was between the back of the bumper mounted 7 pin receptacle and the wiring harness connector that plugs into it. It wasn't seated completely and connections were dirty and corroded.
Removed the receptacle from the bumper, cleaned contacts and wiring harness connector and completely seated the 10 pin wiring harness connector into the back of the 7 pin receptacle. Problem solved.
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'05 Ram 3500 DRW, LB, CTD, 4x4, 6 spd manual (NV5600), PacBrake Airbags and PRXB exhaust brake
'01 Corsair TC 10'8" (4,200 lbs wet wt. and loaded)
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