gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Starter Motor|Service and Repair > < Diagram Information and Instructions|Page 8789
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A dirty commutator

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Other causes listed under test result number 4 (above).

6. High, no load speed (RPM) and high current draw (amps) indicating shorted fields.

Install a new field coil assembly, then check for improved performance.

Starter Motor|Service and Repair > < Diagram Information and Instructions|Page 8789