How to Use a Voltmeter Turn it on, select the direct current setting and test on a machine with a 12-volt battery. By Dan Anderson. Updated November 17, 2020 08:45 PM ...

If you’ve never used a voltmeter to test electrical circuits on 12-volt farm equipment, cars or trucks, but wanted to learn, here’s how: Voltmeters cost from $15 to $300. $50 will buy an ...