It sounds as though your house system is not charging the coach batteries. I don't know of Coachman rigs do this or not - some coaches do not include this feature for some reason (Winnabago did not for many years and still does not in some models). Ask a Coachman dealer about yours.
If yours should be charging the chassis batteries, it may be that the relay that interconnects to the two systems may be failing.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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