Onan 6.5 Genset issue

I have an Onan 6.5 Genset on my Carver 3607 '87 and while I can crank it up with no problem it won't shut down with either switch. I try to turn it off using both the switch on the unit itself and on the breaker panel. I can only get it to shut down by pulling a fuss. Any ideas on what the problem might be?

I had one suggestion that the ground wire is loose. I have checked all the connections I can get to easily with no luck. But before I started tracing things I figured I would ask.

Thanks for any ideas.

It is a gas generator. The solenoid sounds like that could be it and I found the manual so I will study it and go from there. The only good mechanics in my area that even know this genset are backed up for weeks so I'm just going to make a run at it myself.

Thanks for the ideas.