Wiring a 4-Way Switch

I have should have three switches that control the four can lights in the ceiling of my upstairs hallway.

• When I moved in only two of the switches were working and the third was not connected to the wires.
• The two black wires were connected with a wire nut and the two red wires were connected with a wire nut in the box.
• I purchased a 4-way switch to replace the unconnected switch.
• I cannot seem to get the wires connected to the 4-way switch so that all three switches control the lights at all times.
• No matter what I try there seems to be position that the switches get into that renders the other switches inoperable.

Background: Karen, a Homeowner from San Diego, CA

Dave’s Reply:
Thanks for your electrical question Karen.

How to Wire 4-Way Switches: How to connect the wires 4-way switch wires so that all three switches control the lights at all time

The links below take you to full wiring diagrams with instructions that will help you identify the wiring method used in your home and assist you to wire your 4-way switch.

The Following links will assist you with 4-way switches

Light Switch Wiring
Wiring Diagrams

For more information about 4 Way Switch Wiring
4 Way Switch Wiring

4 Way Switch Wiring

• Fully explained 4 way switch diagrams. 4-way switches are a convenient way to operate lighting fixtures from three or more locations.
• The electrical wiring adds additional wiring to the same principles of 3-way switching.