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I agree with gmc, while the chassis battery not charging happens, it is not normal. Mine was one if those and it was a miswired BIRD. Others have had problems with their Trombetta sticking (apparently petew's problem) or not functioning correctly or a bad BIRD. In my Axis (at least) the Use/Store switch is not absolute in that it only disconnects the coach batteries from the coach and generator/shore power. On the other side, the alternator is connected directly to both the chassis battery and (thru the Trombetta) to the coach batteries. So the coach batteries will charge with the alternator even with the Use/Store switch in the store position. The system is not simple or transparent and there are many pieces to go wrong or be miswired.
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