Report "I have a 5000 watt marine generator .Built In the boat from new (2007)Fourwinns 318 vista.It was tuned up at 130 hr. It was running great only the air conditioner was on,it stopped as if I turned it off .Tried to start it but no response of power .I had a marine mechanic look at it ,he said when he got it running at ran good but had to hold the start button down,when he let go of the button it would stop.He checked all the fuses and they were ok.He seems to think it needs a new control box (black box on the top right side.what do you think?"