Problem turned out to be in the shutdown system that is on my NL generator. This system have sensors/switches for low oil
and something on the exhaust
which I need to ask the mechanic
about the next time I see him as I don't know what that one does.
Anyway, I noticed during my trouble shooting that the generator would run if the "shutdown/bypass" switch was held down (don't do this for long as you can burn out the preheat). I did disconnect the oil pressure safety
switch to see if that was the problem but chickened out before disconnecting the other safety
Long story short: if your NL genset runs only when the bypass switch is engaged (of course assuming one has oil in the engine
is coming out of the exhaust
, etc.) you may want to try disconnecting the "safety" switches to see if one of them is the problem.