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Rotor Field Winding Test

  1. Separate alternator halves. To check for grounds, attach ohmmeter leads to rotor shaft and one slip ring (test both slip ring circuits). If reading is not infinity, replace rotor.
  2. To test for open field, touch one ohmmeter lead to each slip ring. Resistance should measure about 2.2-3.0 ohms. If not, replace rotor.
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