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Bench Tests: Armature

  1. Test armature for shorted coils with a growler. Check for grounded coils with a test light. Place one lead on armature shaft and other lead on commutator. Test light should not light. If test light lights, armature is grounded and should be replaced.
  2. Turn commutator in a lathe if it is rough, worn, or has protruding insulation. DO NOT  turn to less than 1.65" (41.9 mm) diameter. Sand commutator lightly with 240 grit emery paper and clean out the slots.
CAUTION: Some starters have a molded type commutator. The insulation must not be undercut as it may cause serious damage to commutator.
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