[jcus]

This seems weird to me, when I start my generator the 120v compressor starts running full time. I tried this twice and both times I started the generator the compressor started running. I had the coach plugged into shore power at the time. The previous owner had a new compressor installed in 2015, and he rarely used the generator. Could this be wired wrong is is this expected behavior?
Thanks
Mike

Doesn't appear normal, sounds like it is wired into gen output before transfer switch, otherwise would run on shorepower also. Check and make sure it is cutting on and off at proper pressures also.
Jim

I am not sure how to check if shutting on and off on proper pressures. It has seemed fine both parked hooked to shore power and in travel mode. I was just running the generator to exercise it, and notice the compressor coming on. If it was wired before the transfer switch would it work normally on shore power?

If wired before transfer switch it should only work on gen power. In travel mode, [with engine running] there is no need for it to run. Try dumping air with hwh and raising coach with hwh, on shorepower, with engine off, you should hear comp come on when air pressure, [dash gauge probably drivers side] falls below 70 psi or so. will shut off at 90. psi or so. This will tell you if it works on shorepower.