Welcome to iRV2.com, Mike!
I would suspect there as an Automatic Transfer Switch in your coach. If you can look around where the shore power cord enters the coach it may go into a box, small shoebox size, with two other cords or conduits coming out. If you see this you have a transfer switch. You can open it and carefully meter the terminals with a DMM to determine whether you have generator power going to it and whether it makes it out.
Good Luck!
Stewart
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Stewart, Brenda and kids
2008 Newmar Canyon Star 3410, now at a new home
2006 Roadtrek Versatile 210
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