Leviton 3-Way Dimmer Switch Installation: A Step-by-Step Guide
Are you looking to upgrade your home's lighting with a Leviton 3-way dimmer switch? This comprehensive guide will walk you through the process, ensuring a safe and efficient installation. Remember, safety first! Always turn off power at the circuit breaker before starting any electrical work.
Understanding Your Wiring
Before you begin, it's crucial to understand your current wiring setup. A 3-way switch controls lights from two different locations. Typically, you'll have three wires: two travelers (black and red) and a ground (green or bare). If your wires are not color-coded, you may need to perform a continuity test to identify them.
Gather Your Tools and Materials
- Leviton 3-way dimmer switch
- Screwdriver (flathead and Phillips)
- Wire stripper
- Needle-nose pliers
- Wire connectors (wire nuts)
- Electrical tape
- Voltage tester
Preparation: Turn Off Power and Remove the Old Switch
First, turn off power to the circuit at the circuit breaker. Use a voltage tester to ensure the power is off before proceeding. Remove the switch cover plate and unscrew the old switch from the electrical box.

Identify and Connect the Wires
With the old switch removed, you'll see the wires. Connect the ground wire (green or bare) from the dimmer switch to the ground wire in the electrical box. Twist the wires together and secure them with a wire connector. Wrap the connection with electrical tape for added protection.
Next, connect the black and red traveler wires to the dimmer switch. The specific connections will depend on your switch model. Consult the manufacturer's instructions for your Leviton switch. Typically, one traveler wire will connect to the 'Common' terminal, and the other will connect to one of the 'Traveler' terminals.
Install the Dimmer Switch
Once all wires are connected, gently push the dimmer switch into the electrical box. Secure it with the provided screws. Replace the switch cover plate.

Test Your New Dimmer Switch
Turn the power back on at the circuit breaker. Test your new dimmer switch by toggling it on and off from both locations. The light should dim smoothly with the new Leviton 3-way dimmer switch.
Troubleshooting Common Issues
| Issue | Solution |
|---|---|
| Light doesn't turn on | Check all wire connections. Ensure power is on at the circuit breaker. |
| Light flickers or dims inconsistently | Ensure all wires are securely connected. Check for any loose connections. |