Cummins/Onan — Voltage Adjustments (AVR-A and B)
Adjustments · Automatic Voltage Regulator
From a Cummins/Onan service manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- HAZARDOUS VOLTAGE. Touching uninsulated high voltage parts inside the control and power output boxes can result in severe personal injury or death.
Procedure
- Use control panel mounted output voltage trimmer, if provided, for small voltage adjustments.
- Measure generator output voltage while set is running without load at nominal frequency.
- If trimmer does not provide enough adjustment, set it at midpoint.
- Turn VOLTS ADJUST pot until rated voltage is obtained.
- Turn clockwise to increase output voltage; counterclockwise to decrease output voltage.
Tools required
- 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.