Armature Coil Test

Check for continuity between segments of commutator. See Fig 1. If continuity is not present between any segment, replace armature.
Using ohmmeter, check for continuity between armature coil core and commutator. See Fig 2. If continuity is present, replace armature.

Fig 1: Testing Armature Coil For Open Circuit

Fig 2: Testing For Continuity Between Armature Coil Core & Commutator