Cummins/Onan — Testing the Ground Fault Relay
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQAD, Cummins/Onan DQAE, Cummins/Onan DQAF, Cummins/Onan QSM11 engine
Procedure
- Verify N-G Fault Indicator on GFR is not lit; install bonding jumper at facility service entrance if required
- Move control switch to Run position
- Press TEST switch on ground fault relay
- Verify control panel warning message is displayed and Fault Indicator on GFR is lit
- Reset the control panel fault, which also resets the ground fault relay
Full service-parts list: Cummins/Onan DQAD →, Cummins/Onan DQAE →, Cummins/Onan DQAF →
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.