This is a video tutorial in the Electronics category where you are going to learn how to install a three way dimmer switch. Mark Donovan of Home Addition Plus demonstrates how to replace a faulty 3-way dimmer switch in this video. Make sure you buy the right dimmer switch for your configuration and make sure you disconnect the power source before you start the work. Remove the top panel and then remove the screws that hold the whole dimmer switch and pull it out. There are three sets of wires that are connected. First connect the green wire of the new switch to the bare copper wire in the socket. This is the earth. Next disconnect the black wire and connect it to the black wire in the new switch. Follow through with the video to connect the other wires and replace the dimmer switch.