Hello Joe, welcome to the Group.
In our H345 Featherlite with a 17.5kw Powertec and were experiencing the same problem with Generator Starting normally then immediately Shutting off due to Overheat Protection. The Fan was the culprit due to a Power problem to the Fan. Thinking back, a Fuse blown comes to mind. Good luck Joe.
It looks like you're from Montana, we're just up the Street from you in ol Alberta!
Pipeliner Prevost.