Cummins/Onan 14GSBB / 20GSBB — To Adjust the Output Voltage
Adjustments · Alternator/Controller
For the Cummins/Onan 14GSBB / 20GSBB, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan GSBB
Procedure
- Connect an accurate AC volt meter across L1 and L2 while the generator set is running
- With Output Volts selected on the Adjustments Menu screen, press the up or down arrow button to adjust the voltage
- The control allows an adjustment of 240 VAC ± 7% (17 VAC)
- Press the BACK button to save the settings and return to the home screen
Tools required
- AC volt meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 240 VAC ± 7% (17 VAC)
Full service-parts list: Cummins/Onan GSBB →
Source: Cummins/Onan operator's 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.