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Output Test

  1. Ensure connections at battery, alternator, and starter (most vehicles) are clean and tight. Ensure alternator, engine and body are properly grounded.
  2. Ensure alternator drive belt is tight and in good condition. Connect ammeter following manufacturer's instructions. Connect voltmeter leads to battery terminals.
  3. Start engine and run at 3000 RPM. Adjust carbon pile on tester to obtain maximum alternator output. Do not allow voltage to go below 12.6 volts.
  4. Alternator output should equal alternator rated output. If reading is 16-20 amps below alternator rating, replace regulator and retest. If output is still low, repair or replace alternator.
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