While the coach is plugged in put your hand on each battery to check to see if one is really hot, or much hotter than the others by comparison. Typically when one of my 8d batteries has gone bad (sulfating) it gets very hot when being charged, and the entire system discharges quickly. By disconnecting the offending battery the others begin charging normally again. This is a quick way of isolating a bad battery that is sulfating. If you just have a bad cell, or two, then Richard's suggestion will get you there....it will just take a little longer.
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