Generator shutdown solenoid tracking

[Ryan Wright]

Folks,

Something is causing my generator shutdown solenoid to shut down the
engine. Based on forum input and my own testing, I replaced the
voltage regulator to the tune of $200 and no change. Well, now I have
a spare voltage regulator.

So - How can I tell exactly WHAT is causing the solenoid to release?
At this point I suspect a bad oil pressure sensor since the oil
pressure shows really, really high, near 90psi and it never did that
before, but I'd like to be sure before I go throwing more parts at the
problem.

Kohler 12.5kw genset on Yanmar engine.

-Ryan
'86 PT-40 8V92
Tri-Cities, WA