I turned off my Onan and now it starts but doesn't create 110V AC. What's wrong?

The Onan failure is probably a Bridge Rectifier failure. They typically fail while turning off the Onan while the AC (or some other heavy duty AC motor) is running. A voltage transit (called inductive kickback) usually causes the failure.

The OEM Bridge rectifiers are operating very near to their Peak Inverse Voltage (PIV) rating. A simple solution is to replace the bridge rectifier with one having a much higher rating. More.

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