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Starter Cranks Slowly

  1. Verify battery condition. Battery voltage should be 12 volts or more. Load test battery at approximately one-half cold cranking amperage rating. See load tester manufacturer's instructions. If battery voltage is less than 12 volts or loaded battery voltage is less than 9.6 volts, service battery or charging system as necessary.
  2. Perform VOLTAGE DROP TEST  under ON-VEHICLE TESTING. If battery cable voltage drop is .5 volt or less, go to next step. If battery cable voltage drop is .5 volt or greater, repair cable connections or replace cable as necessary. Restore electrical connections and check system operation.
  3. Perform STARTER GROUND CIRCUIT TEST  under ON-VEHICLE TESTING. If ground circuit voltage drop is .2 volt or less, replace starter motor. See STARTER MOTOR  under REMOVAL & INSTALLATION. If ground circuit voltage drop is greater than .2 volt, repair starter/engine ground circuit.
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