When the main power go out the standby generator run for 5 seconds then shutdown with an overspeed fault
Check the mag pickup speend sensor that is screwed in where the flywheel bolts tot he alternator. Sometimes they can pick up chips etc. Unscrew wipe off, screw all the way back in by hand slowly until it makes contact with the flywheel teeth. Then back out 1 turn. Check voltage on sensor wires during cranking, it shoupld be approx 2V AC. If not replace sensor.
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