Turn the power back on and use a noncontact voltage tester to locate the hot wire.
How to install a light switch in an existing wall.
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From the switch new 2 wire cable is run to the new light location.
If the wall is heavily insulated push conduit through the insulation and then feed wires or cable through the conduit.
Unscrew the wire nut holding the two white wires together.
Remove the two 6 32 screws securing the switch in the box.
Pull the switch from the box and loosen the terminal screws slipping the circuit.
Unscrew the wire nut holding the two black wires together on your existing light.
Adding an electrical box to your existing wall for a switch or outlet is easy when you have the right materials and know a few tricks.
Start the light fixture installation project by turning the power off at the main electrical panel unscrewing the switch and pull it out the switch.
Wiring a new switch and light from an outlet in this diagram power is taken from an existing wall outlet for a new switch and light fixture.
Twist the wire nut onto the three wires to secure them.
Remove the cover plate from the existing light switch.
When you need to add an outlet or switch in an existing wall you need to use a special electrical box called an old work box an old work electrical box may be metal or plastic and is specially designed to be installed in an existing wall where it has no support other than the wall itself.
This project guide will walk you through the process of installing the switch including wiring both the switch and the fan.
And you don t have to remove any drywall except for the box s cutout itself.
See the video above for more specific instructions.
Strip the last one inch of your new black wire and place all three black wires together.