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Really doubt that you have bad switches as excessive arcing or wear of contacts inside is what kills them. Expect that you really don't have 12vdc going to the high current draws like water heater due to poor connections on 12vdc side or the ground side. Trust you didn't turn off the isolation switch in the convenience center and just run down the battery/ies.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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