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Stator Test

NOTE: Delco 17SI alternator has delta stator windings and cannot be checked for open circuit.

For 12SI series alternator, measure resistance between stator leads. See Fig 1. If reading is not infinity, replace stator.
On all models, connect ohmmeter leads to any stator lead and to stator frame. Ohmmeter reading should be infinity. See Fig 1.

Fig 1: Testing Stator for Open or Grounded Circuits