Low AC Output
Generac
Loss of AC generation
Controller indicates 'Low AC Output' or 'No AC Output'; generator runs but produces little or no voltage.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed AVR, Loss of residual magnetism, Open stator winding, Broken rotor field circuit
How to Fix / Troubleshooting
Safety: Isolate the generator from all loads. Use proper PPE when working inside the generator end.
- Measure output: Confirm low or zero voltage at the generator terminals with a multimeter.
- Inspect AVR: Check for burnt or damaged AVR. Replace with the correct Generac AVR if defective.
- Check stator continuity: With the engine off, measure resistance between stator leads. An open circuit indicates a broken winding requiring stator replacement.
- Field flashing (advanced): If residual magnetism is lost, a qualified technician can flash the field using a DC source to restore magnetism.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Voltage Regulator
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