Time to get out the voltmeter... does require removing electrical covers and exposing potentially live wires - if you aren't comfortable working with electricity - then don't...
Before that - does the generator provide 110 to the coach?
If so - suspects would be shore power supply, power cord, connector to coach, surge suppressor (if present), and transfer switch.
If the generator doesn't provide power either - then start at the transfer switch - that's where the 2 sources come together.
At each point you should be able to measure voltage.. Assuming 50A rig - should read 110 from either hot to neutral, and 220 from hot to hot (if using a 50A to 30A adapter, hot to hot will read 0 volts - that is ok...)
If everything is fine up to the transfer switch - continue to the breaker panel.
Access will be the biggest issue - in my rig, most of that is under the bed.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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