Onan generator is turning itself on

I pushed around in the cable harness in the left compartment trying to sort out which was the battery cable connection. I was thinking I would disconnect it. While I was pushing the cables the rumbling, which had morphed into what sounds like a starter clicking, stopped and the switch light stayed off. Then, on DrewE's suggestion, I found what the manual calls a circuit breaker and flipped it. It is a tiny little flip switch. So far so good for the past 20 minutes.
I know nothing so trying to sort out the remote cable is probably beyond me. It's not labeled in the manual.