Onan Micro Quiet 4000 Gas Powered Generator Won't Crank

Can't add much to the above, except I've found the Coach/House Battery has to be in TOP condition to crank that little ONAN. I know that suggests that Engine Running + Emergency Start, should crank it. Still wanted to mention my experience.

Taking this as Reminder to go exercise our genny.

Can somebody provide the Wrench Type/Size our OP should try on that Flywheel?

In the past when the house battery was too weak to start my Onan MQ4000 I would:
1) start the MH's engine
2) go back to the test panel
3) push down on the generator rocker switch to prime it
4) push up on the generator rocker switch to start it
5) turn off the MH's engine

I'm not sure why it works, but it does on my MH. YMMV


EDIT: had the "down" and "up" reversed

Open generator shroud on the ONAN cover (with the two flip latches). You can reach the flywheel pretty easily from the left side; it's basically in line with the vertical baffle in the generator case.

Check the voltage at the generator when trying to crank, and in particular across the starter solenoid. It may be as simple as a bad connection there, or a loose control wire on the solenoid. Hopefully it's not the starter itself or a connection to it as you need to entirely remove the upper generator case, which generally means dropping the generator. On my Coachmen, it took me a good portion of a day to disconnect the necessary connections and drop the generator (to change out a broken starter).

What's its fuel source? My generator gets its fuel from the RVs gas and the system stops it from starting when my RV fuel tank is below 1/4 full.

Other usual problem is enough fuel in the system. You have to prime the heaven out of small generators some times to get them to start.

Boy, did that take a long time to figure out.