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Message: <blockquote data-quote="SLE" data-source="post: 296900" data-attributes="member: 3889">The battery should be the least of your worries. Fried ecu’s For your engine(s) and other direct wired electrical equipment would be my bigger worry at the moment. I would pull the battery, hook it up to a regular charger and see if it’ll take a charge with nothing hooked up. If it takes a charge, great if not go get a fresh one and cross your fingers that’s the only issue. If stuff isn’t working when you know you have a good battery hooked up, start tracked down fuses.theres a good chance your on board charger recognized the reverse polarity and didn’t try to charge it, most on board chargers now days are pretty smart.good luck!- - - Updated - - -FWIW, I changed out my camper battery this year and hooked them up backwards. Luckily it blew the three 30 amp fuses and that appears to be the only issue. I noticed mine quick because it arc’d pretty hard when I connected the cables. Didn’t catch the fuse situation for a week until the battery was dead and I realized the converter wasn’t charging the battery with the camper plugged in. In my defense, the camper manufacture used black for Hot and White for negative on a 12V system. It should’ve been red & black and red is hot and black is negative! Not white and black which are 120V colors. First time in 30 years I’ve ever seen that. Still dumbfounded they have it that way on a relatively high end 2016 fifthwheel.</blockquote>

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