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Bench Testing: Armature

Test armature for shorted coils with a growler. Check for grounded coils using a self-powered test light. Place one test lead on armature core or shaft, and other test lead on commutator. Lamp should not light. If lamp lights, armature is grounded and should be replaced.

CAUTION: Some starters have molded-type commutator. Insulation must not be undercut on these models as this may cause serious damage to commutator.
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