What would make the overload light come on on my GenSet???

enblethen, Thanks for your response. I will try that tomorrow. I do wonder however how I could be using the gen all this month and then that starts to happen only now.
Also, I believe there is a short in the wall mounted systems monitor as it has gone dark. I think that whatever has happened in there, on that small circuit board I see behind the front facia, has caused the genny to act in a way that replicates an overload somehow...