Parts Replacement & Testing: Armature

With armature removed from starter, check for shorted coils in a growler. Check for grounded coils by touching one test light prod to armature shaft and other test prod to each commutator segment in turn. Lamp should not light. If lamp lights, armature coils are grounded and armature should be replaced. Commutator should be smooth and clean and runout must not exceed.003". If runout excessive, reface commutator in a lathe, remove only sufficient material to provide smooth even surface.