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Home › Merkur › 1988 › XR4Ti Standard › Repair and Diagnosis › Electrical › Charging Systems › Alternator - BOSCH › Testing (On Vehicle) › Output Test

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. Start engine and allow to idle. Adjust carbon pile on tester until voltmeter reads 13.5 volts. Alternator output should be 30-40 amps.
  3. Repeat process at 1000 RPM. Alternator output should be 55-65 amps. Repeat test at 2000 RPM. Alternator output should be 80-90 amps. If alternator output is low, remove alternator for testing and repairs.
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