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Output Test

  1. Ensure connections at battery, alternator, and starter are clean and tight. Ensure alternator, engine and body are properly grounded. Ensure alternator drive belt is tight and in good condition.
  2. Connect ammeter following manufacturer's instructions. Connect voltmeter leads to battery terminals. Run engine to 2000 RPM. Adjust carbon pile on tester until voltmeter reads 12 volts. Alternator output should be 49-55 amps. (55-amp alternator), 63-70 amps (70-amp alternator), 31-80 amps (80-amp alternator), 81-90 amps (90-amp alternator). If alternator output is low, replace alternator.
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