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Rotor Test

  1. Using an ohmmeter, measure resistance between rotor and slip rings (STEP 1 in illustration). See Fig 1 . If resistance is less than 5 ohms, replace rotor.
  2. Using an ohmmeter, measure resistance between slip rings (STEP 2 in illustration). See Fig 1 . If resistance is greater than 3.5 ohms, replace rotor.
Fig 1: Testing Alternator Rotor
G91D02005Courtesy of GENERAL MOTORS CORP.
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