Cummins/Onan — Test Stator Continuity

For these Cummins/Onan models: 04SXINIA, 102SXIN1A, 208, 2SX5IN, 2SXIN, J-Series, O6SXIN1A, O7SXIN1A.

Applies to: Cummins Onan 04Sxinia, Cummins Onan 102Sxin1A, Cummins Onan 2Sx5In, Cummins Onan 2Sxin, Cummins Onan J Series, Cummins Onan O6Sxin1A, Cummins Onan O7Sxin1A

Procedure

1. Disconnect the generator output leads in the control box.
2. Use the wiring diagrams to determine the output leads in the control box and the output lead coding.
3. Using either the test lamp or an ohmmeter, check each winding of the stator for grounding to the laminations or frame.
4. Note: Some generators have ground connections to the frame. Check the wiring diagrams.
5. Using an accurate ohmmeter, test the resistance of each stator winding.
6. Compare the resistances obtained. All windings of equal output voltage should indicate about the same resistance.
7. An unusually low reading indicates a short; a high reading an open circuit.
8. If the ohmmeter required for this test is not available, check for open circuits with the test lamp.
9. If any windings are shorted, open-circuited or grounded, replace the stator assembly.
10. Before replacing the assembly, check the leads for broken wires or insulation and replace any defective lead.
11. If this does not correct the fault, replace the assembly. Only a competent rewinding shop should attempt to rewind a defective stator.

Source: manual:Onan Magneciter Service- SECTION 4. REVOLVING FIELD GENERATORS.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.