Well I don’t know your coach at all, but “residential fridge” from the manufacturer (not after market) suggests an inverter on board. I think 16ACE27 has the right idea.
You say no power to the fridge or “certain outlets” which I assume are all fed off the inverter AC output (like TV etc). Usually when you are on shore power the inverter should sense the 120VAC and internally operate a relay that allows the shore power through to the fridge and related outlets. When the shore power is removed the inverter senses this and its transfer relay drops out to now connect the inverter output (120VAC) to the fridge and related outlets. So you don’t really say which situation is not working.....shore power or battery feed to the inverter. Does the inverter work or are there any alarms on it?
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