The last problem I had like this was the ground on the plunger switch that turns off the fan when the lid comes down.
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2013 Winnebago Journey 36M DP. Full time since 2015. 1987 FJ60 Flat Towed, FAILING 2000W of GRAPE Solar, 800AH LifeBlue LiFePO4 batteries (excellent), SMI Toad Brakes.
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