Armature Check

Armature Short Circuit Test:

1. Check that the armature coil is not shorted.
2. Place armature in a growler.
3. Hold a thin steel blade parallel and just above while rotating armature slowly in growler. A shorted armature will cause blade to vibrate and be attracted to the core. Replace shorted armature.

Armature Coil Grounding Test:

4. Check the insulation between the armature coil cores and the commutator segments. They are normal if there is no continuity.

Armature Coil Open Circuit Inspection:

5. Check for continuity between segments. The condition is normal if there is continuity.