Cummins/Onan — Test Stator Continuity

Testing & diagnosis

From a Cummins/Onan service manual covering: 02SX1N1A, 04SX1N, 04SX1N1A, 04SX1N1B, 04SX1N2B, 04SX1N3B, 04SX1N4B, 06SX1N, 06SX1N1A, 06SX1N1B, 06SX1N2B, 06SX1N3B…. Check it applies to your exact model before use.

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Procedure

1. Disconnect generator output leads in control box. Use wiring diagrams to determine output lead coding.
2. Using test lamp or ohmmeter, check each winding of stator for grounding to laminations or frame.
3. Using accurate ohmmeter, test resistance of each stator winding. Compare resistances obtained.
4. All windings of equal output voltage should indicate about same resistance.
5. Unusually low reading indicates short; high reading indicates open circuit.
6. If any windings shorted, open-circuited or grounded, replace stator assembly.
7. Before replacing assembly, check leads for broken wires or insulation and replace defective lead.

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.

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