[Walker]

Basically the run switch by passes the sensors until it is running. Sensor are water temp switch, exhaust temp switch and the oil pressure switch. Try by passing each of these one at a time. If you bypass one of them and it cures the problem, then the problem is either that particular switch or what it is detecting, exhaust, water or oil. 

Do you have the owners manual? There is a simple to follow troubleshooting guide which MAY help in this case. But above is a good start. I have a diesel generator so I am assuming gasoline has the same switches BTW. 

Just re-read that you do have the manual, I apologize for that. 

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Basically the run switch by passes the sensors until it is running. Sensor are water temp switch, exhaust temp switch and the oil pressure switch. Try by passing each of these one at a time. If you bypass one of them and it cures the problem, then the problem is either that particular switch or what it is detecting, exhaust, water or oil. 

Do you have the owners manual? There is a simple to follow troubleshooting guide which MAY help in this case. But above is a good start. I have a diesel generator so I am assuming gasoline has the same switches BTW. 

Just re-read that you do have the manual, I apologize for that. 

Tom,
Thank you for the reply. I know about the sensors but I did not know that they are bypassed when I toggle the "run" switch - that is good info.
Do you have any tips regarding access? I can't even find these sensors with a mirror let alone remove and replace them.
I wish I had an access panel cut into my step up into the cockpit where I could then easily gain access to the aft side of the generator.
Thanks again.