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Rotor Test

  1. Test rotor for grounded, open or shorted field coils, using an ohmmeter. See Fig 1 and Fig 2 . Touch ohmmeter probes to shaft and each slip ring. Test for grounds between each slip ring and rotor shaft. No continuity should exist.
  2. Check for open field by connecting ohmmeter leads across slip rings. Normal resistance reading with rotor at room temperature is 1.7-2.1 ohms for 114-amp alternator and 1.5-2.0 ohms for all other models.
  3. Readings between 2.5 and 3.0 ohms would result from rotors operating at high engine compartment temperatures. Readings above 3.5 ohms indicate high resistance, possibly requiring rotor replacement. If reading is below 1.7 ohms (114-amp alternator) or 1.5 ohms (all other models), the field coil is shorted.
Fig 1: Test Connections for Rotor Ground Test
G10022Courtesy of CHRYSLER MOTORS.
Fig 2: Test Connections for Open or Short Tests
G10023Courtesy of CHRYSLER MOTORS.
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