Thanks for the suggestions on the generator everyone! I had located all the breakers and the junction box where the shore power and generator inputs are.
What I didn't find, until after I traveled up to an Onan service center 20 mi. away was the reset button... fun drive though since this thing handles unbelievably well for a bus!
So the guy checks ouput at the jct. box with a voltmeter, which I did last night, and gets nothing. Then he walks around to the GenSet and begins to explain the little white reset button on the right side of the unit...Dohhhhhh!!!
How did I miss that?
I did find out there is no way you can buck current between the two power systems since the relay only allows power from one or the other.
As near as I can figure, here's what happened. When I unintentionally switched on the shore power both AC units were running off the Genset and the my shop breaker tripped again. When the relay switched back to generator, the load of both runnig AC units came all at one time and the surge caused the GenSet to overload and pop it's reset button story and... at least that's my story and I'm sticking to it!
I feel pretty chagrined about it all, stupid even, but it didn't cost me anything but some fuel and I learned something new about my MoHo. Plus, I bought a new air filter for the Onan.
One final note, I got my "service" manual yesterday. I must say it is probably one of the poorest manuals I've ever purchased, and I've got a lot of them: IH, CAT, Chiltons, etc.... It certainly was no help with this problem.
If youre expecting useful wiring diagrams and a detailed shop type manual, don't waste your time. BTW, there are no 110V diagrams and the 12V
circuits are almost comical. My advice to anyone considering buying one is save your $85!