Of course you can use a two wire timer even if you have four wires available.
Add timer to existing light switch.
Turn off the circuit breaker that is delivering power to the switch you are planning on replacing with the timer.
When you re doing daisy chain wiring on a light fixture each pigtail usually contains three wires but there could be more if you re adding more than one extra light.
With these switches if you ever want to turn the lights on and off outside of the scheduled times just press the entire door cover.
Remove the top and bottom screws that secure the switch to the wall box.
A timer switch is an inexpensive device that automatically turns your outdoor lights on or off according to your setting.
The source for this circuit is at an already existing light fixture and a 3 wire switch loop run from there to the switch box.
I am only installing the timer on one switch.
Unscrew the wire nut holding the two white wires together.
The light will turn on or off without interfering with your pre programmed schedule.
Pull the switch out of the box carefully by.
If you don t have someone.
Below are the materials that you need along with the instructions on how to install a timer switch in outdoor lighting.
Timer has four colored wires to attach to existing wiring.
There is an existing light and existing switch.
I would like to change the fan switch into a timer and my timer has only two soft black wires.
I would also like to add power through down to a new receptacle that is not switched.
Wiring diagram for a new switch and light.
Existing light switch is connected using only black wires.
Removing the existing switch.
Push the timer switch into the box so the flanges on the switch are flush with the wall and aligned with the screw holes in the electrical box.
In this diagram a new switch and light are added to an already existing light switch.
If the box is metal be sure any exposed switch terminals are not touching the box.
Arrange the wires so they fit in the electrical box.
Just remove the existing switch and connect the timer to the two wires that used to be connected to the switch.
There is an existing fan and existing switch.
If you re just adding one the wires in the pigtail include the live circuit wire the wire going to the new fixture and the wire from the existing fixture.
Strip the last one inch of your new black wire and place all three black wires together.
Insert timer switch into box.
These are super simple to install.
The last thing left to do is program your light switch timer to turn on and off whenever you want.
Twist the wire nut onto the three wires to secure them.
This 3 wire switch loop satisfies the nec requirement of a neutral in the switch box.
White wires are just all bundled together with a wire nut existing switch is a double plate with a second double plate switch above it to other lights.
