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Home >> Audi >> 1990 >> 200 Base, Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Testing >> Output Check

Output Check

  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/Voltmeter (VAT-40/60 ) or equivalent, following manufacturer's instructions. Connect voltmeter leads to battery terminals. Connect Green clamp (ammeter inductive pick-up) to alternator Brown/Yellow wire to battery (positive post). Start engine and allow to idle. Alternator output should be 20-30 amps.
  3. Repeat test at 2000 RPM. Alternator output should be 90-110 amps or within 10 percent of manufacturer's specification. 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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