I am trying to replace a 3-way switch from Legrand with a dimmer switch from FEIT. I have attached a simple drawing here.
Before I make the change, I would like someone to help confirm the electrical connection.
T1 -> AC_L
T2 -> YL_RD
Neutral -> AC_N (The neutral wire is not used in the 3-way switch but I have access to it).

Thank you so much for your help!

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  • The 2 3-way switches on the first row are in the same wall plate cover. And I am trying to replace one of them with a dimmer switch.
    Commented Apr 18, 2022 at 4:00
  • What model is the dimmer you are using? Also, what do you want to do with the circuit controlled by the other switch on the existing yoke? Commented Apr 18, 2022 at 4:16
  • The current 3-way switch is legrand.us/wiring-devices/light-switches-and-dimmers/….
    Commented Apr 18, 2022 at 4:26
  • The Feit switch is feit.com/product/smart-wi-fi-dimmer
    Commented Apr 18, 2022 at 4:26
  • Can a dimmer switch coexist with a 3-way on/off switch? I don't have any plan with that switch and prefer not to replace it with another dimmer switch unless it has to be...
    Commented Apr 18, 2022 at 4:27

1 Answer 1


3-way dimmers/smart switches don't work like that.

You are expecting this operation to be a "drop-in replacement" - where there would be a direct 1:1 mapping between the old 3-way switch wires and the new switch wires. That's not really how these things work.

There are at least 5 different ways to wire a traditional 3-way circuit. As such, the topology of the wiring of the existing circuit must be researched. Only then can it be determined which location is possible for the dimmer master.

You heard that right - you don't get to decide where the dimmer master is put. You are at the mercy of the wall wiring.

So the next step here is to trace out the entire circuit and determine how the cables are routed. From there, we can look at the wiring options.

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