Wiring a three-way dimmer switch uses four wires and allows you the convenience of dimming the light from separate switches at opposite ends of a room. Pull the switch and attached wires out slightly, taking care not to damage any wiring. Disconnect the old switch by removing the screws. Since the switch cuts the power on and off, there will be a black wire coming into the switch and a black wire leaving. If the light switch has a ground screw on it (usually green and at the bottom of the switch), connect it now. To replace this kind of switch, follow these steps: Turn off the power to the switch at the main circuit breaker or fuse panel. Unscrew the switch from the electrical box and pull it out with the wires still attached. Twist the wire connectors back onto the two sets of wires if you removed a light kit from your ceiling fan. So the new switch has four wires. Step 1 Turn off the electrical power to the three-way dimmer switch by turning the dimmer circuit breaker to the … There are three types of wires that run to most switches: black wires that go to black or brass screws, copper or green ground wires attached to green or copper screws and neutral white wires. Line: Based on STEP 4, label the LINE wire that did test positive for voltage. It is important to understand how these switches are wired before attempting to troubleshoot or replace. A 3-way switch is used on each end with one or more 4-way switches in between the two 3-way switches. In this video I walk through the process of replacing a traditional toggle switch with a more modern Leviton Decora rocker arm switch. Below is a conventional wiring diagram for a 4-way switch configuration. Unscrew all wires. In a double light switch setup, you will have multiple wires including one set each light fixture and … The whites are normally just connected together with a wire nut and the coppers are connected together with a wire nut or grounded to a metal junction box. The other 4-wire bundle will enter the box from the top and have three colored wires (black, white, red) and a copper (bare) one. Load: Based on STEP 4, label the LOAD wire that did not test positive for voltage. First of all we should connect the ground wires to the box. Follow the directions. With the power coming to the switch and then going to the lights, you will notice that there are two black wires, two white wires and two ground wires (bare wires). (assuming it is a steel box). Insert the light kit or the switch housing cap into the bottom of the switch housing. Normally when you replace a light switch, you would leave the neutral wires alone, but in this case, we’ll be connecting them to the new combo switch. 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