Step 3. Remove the switch from the box by unscrewing the two long screws
that hold the switch to the box at the top and at the bottom. Once the
screws are out, hold the top and bottom of the switch, and carefully
pull the switch away from the box.
Step 5. The timer will have
two black wires, called leads, coming out of the timer’s plastic body
The leads, like the two black wires coming out of the wall, are
interchangeable, so you can’t mix them up. Place the stripped end of one
of the black leads and the end of one of the existing black wires into a
wire connector (the dimmer will come with twist-on wire connectors).
Twist the wire connector clockwise until it is tight. Hold the wires and
tug gently on the connector to ensure that it is fight. Connect the
other lead to the other wire from the wall in the same way.
Step 4. Remove the switch completely by unscrewing the screws that hold
the two wires to the switch. In most cases, there will also be two white
wires connected with a wire connector in the box. You won’t have to deal
with these in your installation.
Step 6. Once the wires are
firmly connected, you can attach the switch to the box. Tuck the new
timer switch and wires neatly back into the box. Then drive the two long
screws that are attached to the new switch into the two holes in the
electrical box. These screws are typically long, so an electric
screwdriver is handy Pull the dial off the timer so the coverplate will
fit over it. Reattach the coverplate and push the dial back onto the
timer stem. Then, turn the power back on at the main panel and test the