A multimeter is a powerful tool for measuring electrical values such as voltage, resistance, and current, commonly used in ...

The red lead is used to test for 12 volts DC in powered wires or components. The multimeter has a dial that can be turned to different settings.

You also can use a multimeter by turning the dial to read “continuity.” Light switches are plastic but have metal parts to conduct electricity.

This video covers the essential steps to properly test a car's alternator and diagnose common alternator issues. The guide ...