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Bench Testing: Rotor

WARNING: This page is about a different car, the 2004 Lexus LS 430 and 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check rotor for open field windings by using an ohmmeter across slip rings. Rotor resistance should be within specification. See GENERATOR SPECIFICATIONS . If resistance reading is not as specified, replace rotor.
  2. Check rotor for grounded field windings. Using an ohmmeter, check for continuity between slip ring and rotor. Continuity should not be present. If continuity is present, replace rotor.
  3. Check slip rings for wear or pitting. If slip rings are rough, scored or less than minimum diameter, replace rotor.
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