rotorwrench Well-known member Oct 29, 2013 #2 Worn bearings is the most common cause but that can lead to shorting or rubbing of the armature that can do damage to it or the pole shoes. A bad armature or field windings can also cause weak starter operation.
Worn bearings is the most common cause but that can lead to shorting or rubbing of the armature that can do damage to it or the pole shoes. A bad armature or field windings can also cause weak starter operation.