Cummins/Onan — Voltage Calibration Adjustment [A]
Adjustments · Voltage regulator VR21
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- If set has voltage adjust potentiometer R22 on meter panel, set pointer halfway between minimum and maximum.
- With unit running at no load, turn generator voltage potentiometer R26 on VR21 clockwise to increase output voltage.
- Turn R26 counterclockwise to decrease output voltage.
Tools required
- accurate AC voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.