Component Tests and General Diagnostics

Armature Short Circuit Test:

Armature Short Circuit Test
1. Place armature in a growler.
2. 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:

Armature Coil Grounding Test
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:

Armature Coil Open-Circuit Inspection
Check for continuity between segments. The condition is normal if there is continuity.