For all of you who have a multimeter thrown in a drawer or toolbox but don’t know how to use it, these instructions will help in your search for missing voltage.

Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

Below, Donnelly tells AD how to wire a light switch with this simple step-by-step process for a single-pole light switch without zapping yourself along the way.

Using a “test light” has historically been the simplest way to do voltage chasing, on both the power and ground sides of polarity.