Cummins/Onan — Voltage Adjustment Procedure (Set Not Running)
Adjustments · SR voltage regulator trimmer pot
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAL, Kubota D1005 engine
Before you start
- High voltages within the control cabinet can cause severe personal injury or death.
Procedure
- Stop the generator set.
- Open the control box.
- Adjust the trimmer pot a small increment up or down as needed.
- Close the control box, start the set and check output voltage.
- Repeat starting/stopping and adjusting until output voltage is correct.
Tools required
- non-conductive trimpot adjustment tool Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan MDKAL →, Kubota D1005 engine →
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.