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Alternator Output Test

  1. Ensure connections at battery, alternator and starter are clean and tight. Ensure alternator, engine and body are properly grounded. Ensure drive belt is adjusted and in good condition.
  2. Connect Ammeter/Voltmeter (VAT-40/60 ) or equivalent according to manufacturer's instructions. Operate engine at 2000 RPM. Alternator output should be 90-110 amps.
  3. If alternator output is low, remove alternator for testing and repairs. If reading is 16-20 amps less than alternator rating, replace regulator, and retest. If output is still low, repair or replace alternator.
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