How to Use a Voltmeter Turn it on, select the direct current setting and test on a machine with a 12-volt battery ...

When your car doesn’t start, often the battery is the culprit. Unfortunately, most vehicle owners do not check their battery until it fails. As preventative maintenance, the suggested best practice is ...

A voltmeter isn’t the best gauge of your boat battery’s condition. (Pun intended.) But a voltmeter can provide information useful to savvy boaters. Here’s how to use yours.