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A Generac service procedure — check it applies to your exact model before use.

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Procedure

  1. 1. If all diodes test good, go on to Test 10.
  2. 2. in Steps 6 through 9, if any diode reads “infinity” at
  3. both polarities, replace the bridge rectifier.
  4. 3. In Steps 6 through 9, if any upscale VOM reading is
  5. indicated at both polarities, replace the bridge rectifier.

Source: manual:83045.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.