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How do I wire a 3-way switch?
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How to Wire a 3-Way Switch
1. Turn off the power at the main circuit panel.
2. Remove the cover plate from the wall switch.
3. Locate and identify the wires connected to the switch.
4. Disconnect the existing switch wiring by twisting the black and white wires together.
5. Connect the new switch's black and white wires to the existing wires in the same manner as they were previously connected.
6. Connect the remaining wires to the new switch according to the color coding on the back of the switch.
7. Reinstall the cover plate onto the wall switch.