Adding Timer To Existing Light Switch

Wiring diagram for a new switch and light.

Adding timer to existing light switch.

Wiring is explained to give basic instruction how current trave. This 3 wire switch loop satisfies the nec requirement of a neutral in the switch box. There is an existing fan and existing switch. Below are the materials that you need along with the instructions on how to install a timer switch in outdoor lighting.

Remove the top and bottom screws that secure the switch to the wall box. Turn off the circuit breaker that is delivering power to the switch you are planning on replacing with the timer. I would also like to add power through down to a new receptacle that is not switched. This video explains how to add a electrical switch to an existing light fixture in your home.

Make sure the timer is rated for the same amperage as your existing wiring. In this diagram a new switch and light are added to an already existing light switch. Of course you can use a two wire timer even if you have four wires available. Unscrew the wire nut holding the two black wires together on your existing light.

Remove switch cover plate. I would like to change the fan switch into a timer and my timer has only two soft black wires. There is an existing light and existing switch. Timer has four colored wires to attach to existing wiring.

Removing the existing switch. The two switches share a double gang box. Unscrew the wire nut holding the two white wires together. Pull the switch out of the box carefully by.

Remove the cover plate and use an electrical tester to verify that the. Twist the wire nut onto the three wires to secure them. Strip the last one inch of your new black wire and place all three black wires together. 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.

A timer switch is an inexpensive device that automatically turns your outdoor lights on or off according to your setting. Turn off power at circuit breaker. Existing light switch is connected using only black wires. Installing a timer switch in outdoor lighting is the same as installing an ordinary wall switch.

Turn off the circuit breaker or unscrew the fuse that controls the wall switch and fixture. A 15 amp timer will replace most standard light switches. I am only installing the timer on one switch. Just remove the existing switch and connect the timer to the two wires that used to be connected to the switch.