How To Check Alternator Output. 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. If the alternator is not putting out enough voltage in the first test the alternator has a problem.
Alternators power the small engine while it is running keeping the battery charged by circulating power back through the system. Testing the Alternator with a Voltmeter. OK the very first thing that youre gonna do is to check with your multimeter the voltage of the battery while the engine is running.
You need a digital multimeter for this test.
Switch off the engine and check the tension on the drive belt. 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. Checking Alternator Voltage Output With A Multimeter. There are two ways to test the voltage coming from the alternator.
