1 is for the positive (+) source and 1 for the negative (-) source
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To wire a 3-way dimmer switch with two red wires, one black wire, and one green wire to a box with two red wires and two black wires, connect one of the red wires from the switch to the red wire in the box. Connect the other red wire from the switch to the black wire in the box. Finally, connect the black wire from the switch to the remaining red wire in the box. Make sure to connect the green wire from the switch to the grounding wire in the box.
To replace the dimmer switch with a regular switch, connect one black wire to the switch's black screw, the other black wire to the switch's red screw, the two white wires together with a wire nut, and two ground wires to the green screw on the switch. The red wire is likely a traveler wire for a three-way switch setup, so it can be capped off with a wire nut. Be sure to turn off the power before making any connections.
Connect the black wire from the dimmer switch to the black hot wire, the black wire from the existing circuit to the other black wire on the switch, and the green wire to the ground wire or grounding screw in the electrical box. Consult the dimmer switch's instructions or seek help from a professional if needed.
A dimmer switch typically has two red wires to allow for multiple connection options. One red wire is usually connected to the power source, while the other red wire is connected to the light fixture. This setup enables the dimmer switch to control the flow of electricity between the power source and the light, allowing for adjustable brightness levels.
One 3-way dimmer switch, one regular 3-way switch and one 4-way switch. The 4-way is wired between the two pairs of travelers from the other two switches. The common on the dimmer is tied to either the light or to the branch hot and the common on the other 3-way is tied to whichever is left (hot or the light).