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Armature Test

  1. Inspect solder joints between armature windings and commutator bars. If any have come loose, replace armature. If commutator is rough or damaged, replace armature. DO NOT  turn commutator in lathe or undercut spaces between bars. If commutator is dirty, use 400 grit emery cloth to clean it and blow away any copper dust, and clean slots.
  2. 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 come on. If test light comes on, armature is grounded and must be replaced.
  3. If no-load test indicated armature may be rubbing against inside of frame and field assembly, inspect armature for signs of rubbing. If armature is scored only on one side of laminations, armature may be bent and should be replaced. If scoring is all around armature laminations, check frame and field assembly for an out-of-position pole or a foreign object. Repair of or replace frame and field assembly.
CAUTION: Some starters have a molded-type commutator. DO NOT  undercut insulation as it may cause serious damage to commutator.
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