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Armature Test

  1. Disassemble starter. Using No. 300 or 400 grit sandpaper, remove dirt and burn marks from commutator end of armature. Using an ohmmeter, measure resistance between commutator and armature winding bars. If resistance is 5.0 ohms or less, armature is grounded. Replace armature.
  2. Measure resistance between any 2 commutator segments. If resistance is greater than 5.0 ohms at any test point, an open circuit exists in commutator. Replace armature.
  3. Using outside calipers, measure diameter of commutator. If commutator diameter is less than 1.13" (28.8 mm), replace armature. Using a depth gauge, measure depth between commutator segments. If depth is less than .008" (0.2 mm), replace armature.
  4. Using "V" blocks and a dial indicator, measure commutator runout. If runout exceeds .016" (0.4 mm), replace armature.
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