Cummins/Onan RGA-IN1 — Flashing the Field
Repair & overhaul · Exciter field
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
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Before you start
- Incorrect flashing procedure can damage the voltage regulator.
Procedure
- Assemble 12-volt storage battery, 10-amp fuse, momentary-on switch, and diode as shown.
- Connect positive lead to F1 (+) exciter stator lead.
- Connect negative lead to F2 (-) exciter lead.
- Start generator set and operate at normal speed.
- Close momentary-on switch just long enough for output voltage to build up, not longer than 5 seconds.
- Check output voltage, then shut down.
- Restart and operate at no load. Output voltage must build up without field flashing.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- max 5 seconds
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.