[ezdriver]

Here's a strange symptom. My generator does not even turn over, but it emits a squeal like you would make by releasing air from a toy balloon by stretching and squeezing the inlet tube. It emits this squeak for about 4 seconds, then goes quiet. I can also see some levers move, and hear it clicking trying to prime. But it does not crank or turn over.
I ran it a couple of weeks ago with no problems. This just occurred suddenly when I tried to start it yesterday.
Additional information - the temperature is not very cold - we have been in Florida for a couple of weeks, using the motorhome.
If you try to start it again immediately, the noise will not happen. If you wait a few seconds, then try, it makes the noise. But it never actually turns over.
All electrical connections appear solid, and the battery is charged up.
Generator is a Generac.

I hope someone has an idea where I should start with diagnosing this.
Thanks in advance.