I suspect you have a failed starter solenoid. Problem is the solenoid might be mounted to the back wall of the enclosure as with my Generac QP40.
Go to
Generac Power Systems - Manual Search and down load the service manual for your generator. The manual will guide you thru various tests, which are pretty simple, to pin down the problem.
To get to the working parts of the generator it will need to be removed from the coach. It's not hard if you are up to the task and have a floor jack. Once out you can remove the top of the enclosure and get to the problem.
Also highly recommend using OEM replacement parts. My starter failed last year and I replaced it with an eBay China special. Lasted four starts.