Cummins/Onan 3100 series — Flashing the Field (Self-Excited Generators Only)
Repair & overhaul · Exciter stator
For the Cummins/Onan 3100 series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan GGKD
Procedure
- Shut down the set and disconnect the AVR.
- Apply 110 to 220 VAC for one to two seconds to the X and XX leads of the exciter stator.
- Use a diode to establish correct polarity and a 3 amp fuse to prevent over-excitation.
- Alternatively, with the set running and no load, apply a 12 VDC battery for one to two seconds.
- Polarity must be correct: + to X, - to XX.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 110 to 220 VAC for 1 to 2 seconds
Full service-parts list: Cummins/Onan GGKD →
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.