Hyundai Power Products
Loss of Excitation / Alternator Output Failure
Generator runs but produces no AC output at the 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 field winding, Broken excitation wiring, Tripped or faulty main breaker
How to Fix / Troubleshooting
Safety first: Turn OFF the generator, open the main breaker, and disconnect battery negative before opening the alternator terminal box.
- Check main breaker: Ensure the Hyundai main output breaker is not tripped. Reset fully OFF then ON.
- Inspect alternator wiring: Verify that stator and field wires are securely connected and not burnt or broken.
- AVR check: Inspect the AVR for visible damage. If available, test with a known-good AVR of the same Hyundai part number.
- Field resistance: Measure field winding resistance according to the service manual. If open circuit, the rotor/field assembly may need replacement.
- Professional repair: Alternator internal repairs should be performed by a qualified generator rewind shop.
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Repair Difficulty
Professional Required
5/5
Required Part
Alternator Stator/Field Assembly
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