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Testing (On Bench): Stator

  1. Test for open winding using No. 57 bulb or Continuity Light Tool J-21008 in series with 12 volt battery and test probes. Touch one test probe to junction of three stator windings and other test probe to each stator lead in turn at diode connection. Lamp should light. If lamp does not light at any one test point, that section of stator winding is open.
  2. Test for grounded winding with 110 volt test lamp and test probes
    CAUTION: (Diodes should be disconnected from stator leads for this test).

    Touch one test probe to stator core and other test probe to each stator lead in turn. Lamp should not light. If lamp lights at any or all test points, stator winding is grounded and stator should be replaced.

  3. Shorted stator windings are difficult to check due to low resistance of winding. If rotor and diodes are not cause of alternator failure, stator should be replaced.
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