What is a multimeter anyway? Multimeters are covered in cryptic symbols and buttons, but don't let that intimidate you. There are three basic functions you'll use most often: measuring voltage ...

Measuring Voltage With a multimeter, you can measure both AC and DC voltage—particularly useful for locating short circuits or determining if a rechargeable battery is holding a charge.

Battery and charging system testing is another popular use for the multimeter. Batteries should measure 12.6 volts when at rest if fully charged. If not, you may need to isolate your batteries ...

If you’re using a digital multimeter, set the dial to DC voltage. Next, take your multimeter’s black lead to the negative battery terminal and the red lead to the positive terminal.