FG Wilson Loss of Excitation / No Output

Generator runs but produces no AC voltage at terminals

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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, Open excitation circuit, Tripped alternator field breaker (if fitted), Demagnetized alternator

How to Fix / Troubleshooting

Safety first: Ensure the generator is isolated from load. Stop the set and isolate battery negative before opening terminal boxes.

  • Check AVR and fuses: Inspect the AVR in the alternator terminal box for visible damage and check any associated fuses.
  • Inspect excitation wiring: Verify continuity of field wires between AVR and rotor.
  • Measure residual voltage: Start the generator with breaker open and measure terminal voltage. Very low residual voltage may indicate demagnetization.
  • Professional repair: Loss of excitation often requires AVR replacement or specialized re-magnetization; contact an alternator specialist.
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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Voltage Regulator (AVR)
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