Phil, there are several things that could be going on.....you may have a battery, or batteries that have sulfated, and are drawing down the others quickly, or if, as you relate, they are fully charged, then you could have a faulty ground that as the coach cools down becomes worse. You can tell pretty quickly if you have a bad battery by touching each one.....if one has sulfated it will be quite hot to the touch. However, we need more info to be of more help...Jon's questions are good ones.
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