Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Connect a frequency meter to the unit, and check the frequency with no load on the genset.
What is the frequency of the output?
If the genset is running at the proper proper frequency, but has low voltage, it means that the voltage regulator is bad.
And the other unit works correctly?
There are only a few things that will cause low voltage - bad AVR, dirty/worn slip rings/brushes, low engine speed, or a damaged stator.
We have verified the engine speed is correct, you said the stator tests good, and hace tried a different AVR.
Check the brushes and clean the slip rings.
Did you find anything?