Switch With 4 Wires

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Replacing switch: three black wires??? - DoItYourself.com Community Forums

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Replacing switch: three black wires???

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Replacing switch: three black wires??? - DoItYourself.com Community Forums

4 WAY SWITCH & HOW IT WORKS - YouTube

4-Way Switch Installation - Circuit Style 3

How To Replace A Light Switch With 4 Wires | Decoratingspecial.com