Bench Testing Alternator
Get a cheap voltmeter.
Bench testing alternator. If you see higher readings chances are the alternator is good. Howto bench test an alternator. As rr said it s going to need a voltage applied to it s input so it can actually begin it s function.
Then start the engine and check for increased voltage readings. One to ground one to terminal of battery and the correct post on the alternator. Another approach for reducing comebacks and unnecessary warranty returns is to ask your parts supplier to bench test your customer s old alternator and to bench test the new alternator before you install it.
Conduct a voltmeter test. It should hover around 12 volts. I have my alternator in a vice and i am ready with my volt meter battery and drill but i am not sure how to wire it up.
Start the vehicle it ll start and stay running if you have charged the battery put the red multimeter test lead on the battery positive terminal. A 12 volt battery and 2 alligator clip wires will do it. Start date 27 jun 2012.
Put the black lead on the battery negative terminal. With the engine off battery voltage should be between 12 5 and 12 8 volts. The fast and easiest way to test an alternator with a drill a socket and multimeter this way by spinning will produce electricity and therefore test for its functionality please like a share.
27 jun 2012 1 gordontytler new member. If the old alternator passes the tests the problem is obviously not the alternator and you ve missed something. Joined 26 feb 2012 messages 84.