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Rotor Test: Cs144

  1. Scribe end frames to facilitate reassembly. Remove through bolts and separate end frames.
  2. With ohmmeter set to its lowest range, measure coil resistance between slip rings. See Fig 1 . Replace rotor if coil resistance is not 2.1-2.4 ohms at 70°F (21°C).
  3. With ohmmeter set to its highest range, check for grounds between either slip ring and rotor pole piece. See Fig 1 . If reading is not close to infinite, replace rotor.
  4. To reassemble alternator, reverse disassembly procedure. Retain the brushes with the brush retaining pin during reassembly. See Fig 2 . Remove retaining pin after tightening through bolts.
Fig 1: Testing Alternator Rotor (CS144)
G109207Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing Brushes (CS144)
G90H04577Courtesy of GENERAL MOTORS CORP.
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