OK, first off, the converter has nothing to do with this, its purpose is to take 120v AC and make 12v DC to charge the HOUSE/COACH batteries and operate the lights, provide control power for the water heater, fridge, all power for the furnace, vent fans, etc.
Second, do you have an automatic transfer switch, -or- do you have a receptacle in the shore cord storage compartment that you plug the shore cord into, in order to get power in the house from the generator?
Third, open up the generator access door, remove the front cover, on the left will be a start/prime switch, and just to the right of that, nearly out of sight, (look down inside) will be a (usually white) toggle handle that is the output circuit breaker. There will be an automotive fuse close to it which is a 12v fuse for the control circuits.
We know your 120v panel breakers are all OK, as everything operates on shore power.
First pic is an example of a 30TT receptacle fed from the generator that you plug your shore cord into, in the shore cord storage compartment.
Second pic is similar, (but not quite the same) example of the fuse and toggle breaker for the generator output. (this is my 2500LP generator, I could not find a pic of the toggle on my motor home generator.
Charles