This will convert a 2 way to a 3 way switch. Lastly, you could have the switch control just the outlet and nothing else. A few fluorescent lights can be dimmed with special dimmer switches, but most can't. So you’ll connect the black hot wire coming from power to either black screw and then connect the black wire coming from the light fixture to the brass screw. If you aren’t sure how your setup is wired, you’ll have to go through the first step of this tutorial to look into your light switch box. When working on home electrical wiring using voltage testers can play an important part in electrical safety. the switches have red, black and white wire. Electricity flows through the hot wire, entering the switch and then into the light fixture, and then returns back through the neutral wire. Now it’s time to install the switch/outlet combo, and depending on how you want it to work, there are several different ways to wire it up. Before you dive deep into this project, you’ll need a few tools and supplies to get the job done. Types of Electrical Testers However, there are other uses for a combo switch. Before doing so, go to your breaker box and cut off the power to the room where you’ll be changing out the light switch. Make sure that the extension cord is 14/3 (three separate wires that are 14 gauge), and that all of your connections, as well as the switch/outlet combo are put inside of an electrical box for protection and safety. This is perfect for that kitchen scenario mentioned above, where you just want to squeeze in an extra outlet without messing with anything else. There will be one on top and one on the bottom. First and foremost, turn off electricity to the circuit you’re working on. So basically the two wires used for the switch will need to be positively identified, then removed from the configuration it now has, and then spliced to the hot and neutral source.