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NIPPONDENSO Alternators: Overhaul: Testing: Rotor

  1. Check the rotor for open field windings by using an ohmmeter across the slip rings. Coil resistance should be 3.9-4.1 ohms for external regulator models, and 2.8-3.0 ohms for IC regulator models.
  2. Check smoothness of slip rings. Check bearing and replace if necessary.
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