Wrapping up for anyone with an Onan running great that won't produce AC power...
I was able to pry the generator up enough to access the torx screws holding the control panel. That allowed access to the circuit breaker.
One of the connectors to the circuit breaker wasn't making good contact and created huge resistance.That melted something inside the breaker and singed the wires connecting to the breaker.
I replaced the breaker and made sure the contacts were good.
It's fixed. Used the air conditioning off it today.
