Gillette
No AC Output – Dead Alternator
Generator runs but produces no AC output voltage; controller shows normal run status with no fault.
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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
Tripped or open main breaker, Failed AVR, Loss of excitation, Open stator winding
How to Fix / Troubleshooting
Safety first: High voltage is dangerous. Only qualified persons with proper PPE should measure live voltages.
Steps:
- Check main breaker: Ensure the generator output breaker on the Gillette unit is in the ON position and not tripped.
- Measure voltage: With the unit running, measure voltage at the alternator terminals. If zero, suspect excitation/AVR issues.
- Inspect AVR and wiring: With power off, open the alternator terminal box and inspect the AVR and excitation leads for damage or loose connections.
- Field flashing (advanced): Some alternators may require field flashing if they have lost residual magnetism. This should be done only by a technician following the alternator manufacturer’s procedure.
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Repair Difficulty
Professional Required
5/5
Required Part
Alternator Rotor/Field Circuit
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