Initial Inspection and Diagnostic Overview

1. Inspect starter motor armature windings for broken or burned insulation and unwelded or open connections.
2. Check starter motor armature for open circuits, shorts and grounds. Check for pole rub or rub on magnetic shunts.







3. Check commutator for runout. Inspect armature shaft and two bushings for scoring and excessive wear with Dial Indicator and Magnetic Base D78P-4201-B or equivalents. If commutator is rough, or more than 0.12 mm (0.005 inch) out of round, it must be replaced.