I had the same problem. The GFCI would trip, sometimes every time, some times, never. When i checked the junction box mounted on frame rail, was full of water. The junction box, mounted on the frame rail, was mounted with self tapping screws. Directly on the inside of the frame rail was, guess what..... yep, the fresh water holding tank. They had mounted the elec, junction box thru the frame rail, into the fresh water holding tank. When i had over 25% in holding tank, would trip constantly. I drained and cleaned junction box, water proofed back wall of junction box..... no more water in junction box, and never tripped breakers again
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Greg and Criss
Pflugerville, Tx
2016 F-250 Powerstroke
2011 27' RLX
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