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Rotor Test

  1. Using an ohmmeter, check for continuity between rotor and slip rings (STEP 1 in illustration). See Fig 1 . If continuity exists, replace rotor.
  2. Using an ohmmeter, check for continuity between slip rings (STEP 2 in illustration). See Fig 1 . If continuity does not exist or resistance is not 3.1-3.5 ohms, replace rotor.
Fig 1: Testing Alternator Rotor
G91D02005Courtesy of GENERAL MOTORS CORP.
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