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Troy67
Starting Member

Canada
1 Posts

Posted - 03/12/2012 :  05:31:40 AM  Show Profile  Reply with Quote
I am trying to replace the older 3 way switches in my house but am having problems. In the box downstairs I have 2 white wires, 2 grounds, 2 common (black) and one red. In the box in the upstairs entrance I have 1 red, 1 white, and one black wire. The switches I am trying to replace are the older style with two screws on the top and one on the bottom. The new switches have the colored common screw and a brass screw on one side, and 1 brass screw along with the green ground screw on the other. The older switches work, but are outdated and I would like to change them, but I can't seem to get the new ones to work... I have tried every configuration I can think of but can't get the switch with the 3 wires (upstairs) to work with the downstairs on! Can anyone help???

Shadow67

oberkc
Advanced Member

USA
2374 Posts

Posted - 03/12/2012 :  06:12:35 AM  Show Profile  Reply with Quote
It may help to desribe how the wires are connected in the first box. Also, describe which wires are bundled into a single cable. My best guess is one cable (bleck/white) is supply and return from the fixture. White is most likely supply. Attach supply to common screw in first box. Other two screws: connect to red and white of other cable. These will be your travelers. Connect the third (black) conductor to the return wire from the first cable.

At the second switch, connect two travelers to the brass screws and the black conductor to the common.
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