How To Test Amperage On Alternator. Remove battery terminals and make sure these are 100 clean from and buildup of corrosion. With the engine off battery voltage should be between 125 and 128 volts.
Please you shouldnt disconnect the negative battery cable just to test an alternator. Very low differences in voltage between the battery and alternator should also be suspect say 128 volts at the battery. It happens but you can test it to make sure.
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.
Let the engine idle at around 1200 rpm. Hi folks Im trying get a solution for my alternator on my new to me 2520 and before I do I just wanted to confirm that I have a 20 amp. The first course of action is to check the wiring carefully that runs between the alternators main power wire and the battery. Is there a way to test this.
