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Bench Testing: Rotor

  1. Scribe end frames to facilitate reassembly. Remove through-bolts and separate end frames. Using an ohmmeter, check for grounds. See Fig 1 . Reading should be very high or infinite. If reading is not as specified, replace rotor.
    Fig 1: CS144 Alternator Rotor Test
    G109207Courtesy of GENERAL MOTORS CORP.
  2. Using an ohmmeter, check rotor for shorts and opens. See Fig 1 . Replace rotor if reading is not 1.7-2.1 ohms at 70°F (21.1°C).
  3. To reassemble alternator, reverse disassembly procedure. Retain the brushes with the brush retaining pin during reassembly. See Figure . Remove retaining pin after tightening through-bolts.
NOTE: Manufacturer recommends using a new bearing whenever end frames are separated.
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