Winco Voltage Sag Under Load

Generator runs but house lights flicker or dim when large loads start.

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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

Generator undersized for connected load, Weak engine due to restricted fuel supply, Failing AVR, Loose connections in transfer switch or main panel

How to Fix / Troubleshooting

Safety first: Use caution around live panels. Homeowners should limit work to visual inspection and load management.

  • Review load: Identify large loads (AC, electric range, well pump) and avoid starting them simultaneously. Consider load shedding or upgrading generator capacity.
  • Inspect fuel system: Ensure adequate gas line size and pressure to the Winco generator under load.
  • Check connections: Have a qualified person tighten lugs in the transfer switch and main panel.
  • Test AVR: If voltage drops excessively despite proper load and fuel, the AVR may be failing and should be tested/replaced by a technician.
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Repair Difficulty

Hard 4/5

Required Part

Automatic Voltage Regulator
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