Onan 3.6 won't crank

[guy48065]

A friend asked me to help troubleshoot his RV generator.
It will not crank using the onboard start switch or the remote on the switch panel.
Using a meter I verified there is solid battery voltage at the starter solenoid. There is one small white wire on that lug that I assume powers the control & start circuits.
Using a meter I determined which terminal on the solenoid needs switched 12v and I jumped it and the genny cranked.

Anyone have a wiring diagram of the control circuit?
I'm hoping there's a fuse or an interlock somewhere I haven't discovered.

[guy48065]

I assumed there would be but I can't find one.

[Gary45]

There should be a 12 volt fuse near the control panel on the generator. If bad will not crank.