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Something was wired up wrong OR one of the batteries was shorted out. No other reasons for this to happen. Start by having the batteries load tested to be sure they are good. Get some new cables and take photos of all the ones that are damaged FIRST before you take them loose. I suspect you are going to need some assistance from a good mobile tech here to some and assess the problem and help you get this figured out correctly without doing any more damage. You should get a set of wiring diagrams for this coach as that would help. If you can give me the year, make and model of what you have I may be able to assist in this. Attach the photos to your post if you can using the paperclip icon so I can take a look at what you have. All follow ups are included in our fee and fully expected here.
Just checking back in to see if you were able to get this resolved yet or do you still need more input from me here?