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Starter Motor Tests

CAUTION: DO NOT  clamp starter in a vise by field housing. Damage to magnets could result. Starter may be clamped in vise by mounting flange.
  1. Check pinion gear for freedom of movement by turning it on shaft. Check armature for freedom of movement by prying on pinion gear to engage it with shaft.
  2. If gear and armature do not rotate freely, starter should be disassembled. If pinion gear and armature rotate freely, proceed to NO-LOAD TEST  in this article.
  3. No rotation and high current flow indicate:
    • Connecting terminal or armature windings shorted to ground.
    • Seized bearings.
  4. No rotation and no current flow conditions indicate:
    • Open armature windings (inspect commutator for burned commutator bars after disassembly).
    • Broken brush springs, worn brushes, protruding insulation between commutator bars, or other conditions that could prevent good contact between brushes and commutator.
NOTE: For additional basic trouble shooting information, refer to the TROUBLE SHOOTING - BASIC PROCEDURES article in the GENERAL TROUBLE SHOOTING section.
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