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Output Test

CAUTION: DO NOT load electrical system for more than 15-20 seconds during output test or possible system damage may occur.
  1. Ensure connections at battery, alternator, and starter (most vehicles) are clean and tight. Ensure alternator, engine and body are properly grounded. Ensure alternator drive belt is tight and in good condition.
  2. Turn off all accessories. Start engine and allow to idle. Connect ammeter following manufacturer's instructions. Run engine at 2000 RPM. Adjust carbon pile on tester to obtain maximum alternator output. DO NOT allow battery voltage to drop to less than 12.6 volts.
  3. Alternator output should equal alternator rated output, minus 16-20 amps. If reading is more than 20 amps less than alternator rating, replace regulator and retest. If output is still low, repair or replace alternator.
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