I have a 2017 Jayco. Same issue and blew fuses in truck several times. After taking in for warranty work and being told it was definitely the truck, took to Dodge dealer. Mechanic located problem and it was in the Jayco. Driver side, middle light. Apparently when constructed, the wires for the lights were run under an interior wall, and the coating was ground down. Had to complete all the paperwork and sent to Jayco and they honored the work. 5th wheel was under warranty and I had to jump through several hoops but it was worth it.
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