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Generac — Voltage should not drop below about 220 VAC nor rise

For these Generac models: 389/206/163cc, 410cc, GP1800, GP3250, GP5000, GP5500, GP6500, GP7000, GP8000.

Applies to: Generac Gp1800, Generac Gp3250, Generac Gp5000, Generac Gp5500, Generac Gp6500, Generac Gp7000, Generac Gp8000

Procedure

  1. If voltage and/or frequency drop excessively when the
  2. If load voltage and frequency are within limits, end tests.
  3. If the unit is overloaded, reduce the load.
  4. If load is within limits, but frequency and voltage still drop

Source: manual:GP Series Service Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.