How to Wire a Dimmer Switch Using 4 Wires | eHow How to Wire a Dimmer Switch Using 4 Wires. How to Wire a Dimmer Switch Using 4 Wires Wiring a three-way dimmer switch uses four wires and allows you the convenience of dimming the light from separate switches at opposite ends of a room. How to Wire a Light Dimmer Switch. How to Wire Lutron Three-Way Dimmer Switches. You May Like. How do I wire up a 4-wire dimmer switch when I only have I'm replacing (yet again) my bathroom dimmer switch. The old switch had 3 wires: 2 black and one green. The two black wires were attached to the wires coming out of the wall and the green wire was attached to nothing. The new switch has 4 wires: black, red, red/white striped, and green. Can I attach the new switch somehow?
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