Cummins/Onan M-1902s — Voltage Adjustment Procedure
Adjustments · voltage regulator board
For the Cummins/Onan M-1902s, from the Cummins/Onan service manual.
Applies to: Cummins/Onan HDKA, Kubota V1505-E3BG engine
Before you start
- Do not change the 50/60 Hz setting on the regulator.
- Do not touch exposed wiring; stand on insulating mat or dry wood platform.
Procedure
- Attach a voltmeter securely to the L1 and L2 leads.
- Start the generator set and place a typical load on its output.
- Use a flat-blade screwdriver to set the voltage adjust potentiometer for correct voltage.
- Ideal setting is 117 VAC measured at L1-L2 terminals. Retighten the locking nut.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage adjust pot is a 10-turn potentiometer
- Ideal setting 117 VAC at L1-L2
Full service-parts list: Cummins/Onan HDKA →, Kubota V1505-E3BG 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.