![]() ![]() In your box hook the B and C 3-lines up as such: C-black to MC black, C-red to B-red and C-white to B-white.Rewire C to swap the black and white (this helps the sanity of wiring).B will now hook to the 3-line black screw, and the 3-line white and red go to the brass(white) screws (order does not matter).In the B box add your MC black wire to that black wire nut for the other switch.Inside the box, disconnect everything except the ground (hopefully you bonded in step 2).Knock out a hole in each box and clamp the cable You do not need to remove any existing cable. Run your MC cable between the B box and the middle box.Some places have ground pigtails if you don't have enough spare ground wire. Buy some ground screws (they're green) and add some wire between the box and your ground nut. It's also a good ideal to buy some cable clamps to secure it to the wall I think both boxes are a combo 1/2" and 3/4" but measure a knockout to be sure (1/2" clamps are sometimes confusingly labeled as 3/8"). I can't tell if that's 12 or 14 from the jacket so use a wire stripper to confirm size. Go buy some equivalent gauge metal-clad (MC) cable.Per the images you've added here's how I would fix this The problem is that you can't run a multi-way without two travelers. I suspect they tried (and failed) to use the unused white wire to do that. The bad news is you really need a 2-line cable run between B and your fixture. The good news is the 3-line cable can still be used. In other words that's three cables where you have two. That's all going into what is your B switch. 3-line cable running between the switches (two travelers and the switched hot).Load (2-line cable going to my fixture). ![]() I put in a three-way last year and my setup is There's no easy fix with the existing wires here because they tried to make one cable do the work of two. We call the wires connected to them traveler wires. One of the two brass screws will always be hot. A three-way switch changes which wire (in your case the white/brass screws) is connected to the black screw. Whomever did this fundamentally misunderstood how three-way switches work. ![]()
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