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Rotor Test

  1. Using an ohmmeter, measure resistance between rotor and slip rings. Perform STEP 1. See Fig 1. If resistance is less than 5 ohms, replace rotor.
  2. Measure resistance between slip rings. Perform STEP 2. See Fig 1. If resistance is greater than 3.5 ohms, replace rotor.
Fig 1: Testing Generator Rotor (Typical)
G91H02012Courtesy of GENERAL MOTORS CORP.
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