Cummins/Onan — Flashing the Field (With Generator Set Shut Down)
Repair & overhaul · Exciter field / VRAS-2
From a Cummins/Onan service manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- Do not maintain field flash connection to exciter circuit longer than 5 seconds.
Procedure
- Touch the positive battery lead to TB1-9 and the negative lead to TB1-10 of VRAS-2.
- Hold the leads in place for no longer than 5 seconds.
- Start generator and run at no load; unit must build up voltage without field flashing.
- If it does not, shut down and perform continuity check of all related wiring.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.