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Home >> Triumph >> 1981 >> TR8 Automatic Trans >> Repair and Diagnosis >> Electrical >> Charging Systems >> LUCAS Alternators >> Testing >> On Car Testing >> Regulator Test

Regulator Test

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  1. Provide Regulator Test Circuit as shown and gradually increase engine speed to approximately 640 RPM (1, 550 alternator RPM). Test lamp should go out.
  2. Increase engine speed to approximately 2, 500 RPM (6, 000 alternator RPM). Voltmeter should be steady at 13.6-14.4 volts. If reading is not steady and satisfactory Output Test has been performed, regulator should be replaced.
    NOTE: Up to 10 milliamp battery drain is normal, even with the ignition in the "OFF" position.
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