Ceiling fans only work when on shore power.
We have lived full time in a 2007 Itasca Latitude for 9 years. It is usually plugged in to some form of shore power. (20, 30 or 50 amp.) 2 days ago, we drove it from southern Wisconsin to the Chicago ...
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Assuming everything else works fine, and the fans only don't work when you're on battery power, then it's your battery or a connection running to it. Might be multimeter time.
