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. Insert the light kit or the switch housing cap into the bottom of the switch housing. Disconnect the old switch by removing the screws. 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. 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. Since the switch cuts the power on and off, there will be a black wire coming into the switch and a black wire leaving. The hot wire is usually red, but can also be black. Step 1 Turn off the electrical power to the three-way dimmer switch by turning the dimmer circuit breaker to the … Below is a conventional wiring diagram for a 4-way switch configuration. They do not have an on/off position like single pole switches. Neutral: Standard switches do not require them, but the neutral wires will be present in the box. In this video I walk through the process of replacing a traditional toggle switch with a more modern Leviton Decora rocker arm switch. Now that the light switch is completely removed, we’ll need to prepare for the installation of the combo switch. To replace this kind of switch, follow these steps: Turn off the power to the switch at the main circuit breaker or fuse panel. You’ll need access to the white neutral wires. Twist the wire connectors back onto the two sets of wires if you removed a light kit from your ceiling fan. Unscrew the switch from the electrical box and pull it out with the wires still attached. Follow the directions. Unscrew and remove the switch plate; then use a voltage tester to make sure that the circuit is dead. 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). So the new switch has four wires. 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. 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. It is important to understand how these switches are wired before attempting to troubleshoot or replace. Unscrew all wires. Pull the switch and attached wires out slightly, taking care not to damage any wiring. 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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