I have a threeway switch setup that I want to install Blue dimmers on. This is the 5th threeway in my house and they’re all wired slightly differently so it’s been an adventure.
I’m trying to confirm what’s going on and which wiring diagram to use here.
Ideally, I’d have a dimmer in both boxes, but if my suspicions are correct, my only choice is a Dimmer in box A and an aux switch in box B.
Box A:
Box B:
I think this is the way it’s wired:
As this appears to be wired in a Switch Loop, you do not have a neutral, and therefore will not be able to use more than a single dimmer… you will need an Aux switch in the second location.
The diagram you included is more or less correct, aside from the fact that in your situation, the hot is connected to the first switch instead of carried through to the second.
In Box A, you have a 2 wire cable and a 3 wire cable. The white from the 2 wire cable should be your Line, while the black wire should be your Load. You will want to connect the black from the 3 wire cable to the Line as well to supply power to the Aux switch and use the red wire as the Traveler. You will cap off and leave the white wire from the 3 wire cable unused.
