How To Test Alternator Amperage. TESTING ALTERNATOR AMP OUTPUT WITH MULTMETER. Get a cheap voltmeter.
If the lights dim the alternator works. Unlike changing the windshield wiper blades or changing a headlamp light bulb this is one check-up that drivers are reluctant to doThey rather go visit a garage or dealer. Conduct a Voltmeter Test.
With the engine off battery voltage should be between 125 and 128 volts.
Set your multimeter to DC volts. Your vehicles charging system however operates at a. Turn on all the electrical equipment in the car. Clamp the amperage meter around the BAT wire leading from the alternator to the battery.
