Turn on the light or device being controlled by the 3 way switches if you already have them. Now thats sounds easy but you will most likely find that wire way to short to just cut it and install it in a new switch box.
4 Way Switch Wiring Diagram
Install 4 way switch. Then tie the 2 black wires along with the black line wire on the idevices dimmer switch together with a wire nut. If you are installing a new circuit then it is best if you feed the ac power to either the first switch or the light fixture. Remove all wires from the 4 way switch and cap both red wires with wire nuts. Connect the pigtail to the ground wire on the four way switch. So in short you would cut the wire in between the two 3 ways and install a 4 way switch. Starting with safety and understanding 1.
All you have to do is find the 3 wire running from one 3 way switch to the other 3 way switch and install the 4 way switch between the two. Your wiring could be very different. The four way switch is not used on its own but in addition to a combination of switches. Connect both white wires together with a wire connector and stuff them back inside the wall box. This is meant as a guide. If you are replacing a 4 way switch it is only necessary for you to remove the wires from the defective switch and install them on the replacement switch in the same manner.
A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch. I have a few of the most common ways in wiring a 4 way switch to help you with your basic home wiring projects. Turn off electric power. How to fix a 3 way switch problem duration. Craig michaud electrical instructor 12634 views. When connected properly a simple flip of any of the switches will turn on the light.
If the device is still. Take a spare 6 inch length of ground wire and connect it with the two ground wires in the box so you create a pigtail. Return to location you plan to wire to verify that there is no electric flow to that device. Connect the white wire on the idevices dimmer switch to the neutral wire. A three way switch connects travelers from that switch to one side of the four way switch while the other side is connected to the other three way switch and the three way switch is then connected to a light.
Gallery of Install 4 Way Switch
