Cummins/Onan — Testing Generator Stator [C]
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAQ, Cummins/Onan HDKAR
Procedure
- Isolate the stator windings by disconnecting all six stator leads.
- Test for open circuits between T1-T2, T3-T4 and Q1-Q2.
- Test for grounded circuits between T1, T3 and B1 and the stator laminations or other unpainted grounding point.
- Use a megger or insulation resistance meter (not more than 500 VDC); a reading less than 100,000 ohms indicates a questionable stator.
- Test for continuity between coil leads; all pairs should have equal resistance.
- If a winding is shorted, open or grounded, replace the stator assembly; check leads for broken wires or insulation first.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAQ →, Cummins/Onan HDKAR →
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.