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I am trying to replace a light switch and am a little confused at the addition of what appears to be an extra wire:

Current switch wiring: https://www.dropbox.com/s/c58qw5wbno20qhr/IMG_4160.JPG?dl=0 https://www.dropbox.com/s/hmfouqxblht1eiz/IMG_4159.JPG?dl=0

New switch I want to replace it with: https://www.dropbox.com/s/9114mvee5v13pyb/IMG_4161.JPG?dl=0 https://www.dropbox.com/s/elsxlqvw61vhvv0/IMG_4162.JPG?dl=0

This switch does control a light that is also controlled at 2 other light switches in the house, not sure if that has anything to do with it.

The switch next to this one was previously a dimmer but I have already removed that!

How do I hook this up if I only have 2 brass screws on the new one?

  • To answer your next question, the black screw (labeled common ) is super important. The brass screws are the two travelers and they are interchangeable. The wire colors are not important. The screw positions are not important and will not be consistent from switch to switch. – Harper Apr 22 '18 at 20:35
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The existing switch is a three way switch, and the new one is not. You’ll need to get a three-way switch to replace it.

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