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Home >> Pontiac >> 1991 >> LeMans Base >> Repair and Diagnosis >> Electrical >> Starter >> Starting System >> Bench Testing >> Starter No-Load Test

Starter No-Load Test

  1. Connect test equipment to starter. See Fig 1. Close switch and compare RPM, amperage and voltage readings with specifications. See STARTER NO-LOAD TEST SPECIFICATIONS .
    CAUTION: DO NOT  apply more voltage than specified. Excessive voltage may cause armature windings to come off.
    Fig 1: Connecting Equipment for Starter No-Load Tests
    G102067Courtesy of GENERAL MOTORS CORP.
  2. If current draw and RPM are within specification, starter motor is okay. If test indicates low free speed and high current draw, unit may have tight, dirty or worn bearings, shorted armature, grounded armature or fields.
  3. Failure to operate with high current draw indicates a direct ground in terminal fields or frozen bearings. Failure to operate with no current draw indicates an open field circuit, open armature coils or broken brush springs.
  4. Low no-load RPM and low current draw indicates high internal resistance due to poor connections, defective leads or dirty commutator. High free speed and high current draw indicates shorted fields.
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