Cummins/Onan RGA-IN1 — Testing Generator Stator
Testing & diagnosis
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
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Procedure
- Check stator for grounds, opens, and shorts in windings.
- For grounds: use megger applying not more than 500 VDC. Test each stator winding for short to laminations. Reading less than 100,000 ohms indicates questionable stator.
- Oven dry stator and retest.
- For open or shorted windings: test continuity between coil leads. All pairs should have equal resistance.
- Resistance at 77°F (25°C) is 0.167 ohms ± 10%.
- If winding is shorted, open or grounded, replace stator assembly.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 100,000 ohms
- 0.167 ohms ± 10% at 77°F (25°C)
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.