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If you have a multi meter I would test to see how much the rv is drawing when at rest. Take the negative battery cable off and connect the multi meter between the post and the cable with the black lead on the com connection and red on the amperage connection. With a car 25 milli amps or more is too much drain. On an rv I'd expect to possibly see more than that due to the lp detector and radio that still stays somewhat on.
But the way to tell what is drawing the most is to remove the fuses one at a time and see if the drain disappears. Once you find the circuit that is causing the problem you need to figure out what on that leg is bad by leaving the fuse in and disconnecting each item on that leg one at a time and look at the meter to see if it goes away.
With cars I have seen shorted bulbs drain batteries in a couple hours.
Travis
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