How to hook up a two-way light switch A two-way light switch is the most basic type of electrical wiring. It involves a single switch controlling a single light. When you turn the light on, the electricity runs from the light switch to the light and back to the switch. Three-way switches control lights and receptacles from two points: for example, a light in a hallway that can be operated from the first floor and second floor. Learn how to wire a basic light switch and a 3 way switch with our switch wiring guide. See is this is a DIY project you're willing to take on! Wire a 3 Way Switch Connect the ground wire to the circuit ground wire s with a wire nut or other approved connection see How to Connect Electrical Wire. Two way switch hook up the power adapter into the wall outlet. Wrap the second white wire with black tape to show that it acts as a hot wire. Thanks to all authors for creating a page that has been readtimes. The light fixture's box should have only a black wire, a white wire and a ground wire to supply power to the fixture.