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.

You can then use the multimeter’s continuity tester along with a scrap piece of wire that stretches between the two switch boxes to determine the two traveler wires.

A continuity tester checks if these metal parts are worn or broken, and it will light up if the switch is good, while a multitester has a needle or meter that will spring to life.