S10/T10 Blazer 4WD V6-4.3L VIN W (1997)
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Worn brushes
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High insulation between the commutator bars.
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Other causes which would prevent full contact between the brushes and the commutator
5. Low, no load speed (RPM) and low current draw (amps), indicates a high internal resistance caused by the following conditions:
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Poor electrical connections
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Defective electrical leads
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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.
