Just to follow up, there is a multiwire connection plug above the generator in the generator compartment at the very top/back. It's hard to notice unless you are very low. Anyway, it seemed a bit loose although still attached.It's a standard type automative connection. I added two tie wraps through the wire to snug the tow parts up.
So far, the generator has worked. I will report back if we have the intermittent start again. My guess is that connection vibrated a bit loose from time to time. That seems more plausible than the switch being worn out.
