If you find the way to get to the back of the main power center, where the 12 volt fuses and 110 breakers are you will see where the power wire from battery connects to a buss bar supplying the 12 volt stuff and the ground. This should be all.above the floor. No need to drop underbelly cover. Of they have c come loose or disconnected, could be problem. Also that's where the converter should be with the reverse fuses in the converter. My 2 cents worth
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