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Armature Test

  1. Test armature for shorted coils with growler. Check for grounded coils with test light. Place one lead on armature shaft and other lead on commutator. Test light should not illuminate. If test light illuminates, armature is grounded and must be replaced.
  2. Turn commutator in 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 400 grit emery cloth, and clean slots.
CAUTION: Some starters have a molded-type commutator. DO NOT  undercut insulation as it may cause serious damage to commutator.
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