Generator shutdown solenoid tracking

[Ryan Wright]

Thanks to all for the excellent advice on my genset. I'm still SOL
here, unfortunately, however I think I'm on to something and I wanted
some advice:

Per the control system schematic, it appears the overtemp sensor and
the low oil pressure sensor will short to ground if there is a
problem, triggering shutdown. Indeed, I suspect this may be happening,
as my oil pressure gauge reads between 90-120psi. I tested the temp
sensor and there is no path to ground from it's contacts. However,
both of the oil pressure sensors (at least I think both of those
things I found on the engine are oil pressure sensors - I suspect one
goes to the gauge and the other goes to the control unit?) are shorted
to ground. Not the wiring leading from the sensors, but the sensor
terminals themselves.

Does this indicate a faulty oil pressure sensor? Should I replace
them? Is it possible they both went bad?! Unfortunately, nobody around
here wants to look at my generator and I'm not in a position to take
the coach across the state to have the nearest Kohler service center
check it out. Especially not in 100 degree heat, with no generator. So
I'm mostly guessing here and going on what little knowledge I can
gather.

Bob Loomas suggested I check the slip rings and brushes - I've not
done that yet. I have replaced the voltage regulator, didn't help.
Fuel cutoff solenoid wiring appears to be fine and intact, it opens
like it should upon start, just releases immediately afterwards. All
fuses appear intact. I'm not getting any power out of the generator,
though I can keep the engine running by holding the cutoff solenoid
open, I still get zero power output. I don't know if the control
circuitry cuts power output when it triggers the solenoid or not.

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