How do I tie a new switch into existing box?

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Old 05-29-16, 04:21 PM
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How do I tie a new switch into existing box?

I have an electric box above my kitchen sink for a pendant light (left switch on top), garbage disposal (left switch on bottom), and now I'd like to tie in undercabinet lighting (right switch not yet installed).

Here is the new switch I'd like to tie in on the right. It will run to my AC dimmer-compatible transformer for my lights:

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And here are the right and left sides of my existing left switch.

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If I tie in my transformer directly to the left side of the existing switch, and the neutral to the other whites, it lights up fine. I'm just not sure how to wire it in using the dimmer.

Any help would be much appreciated.
 
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Old 05-29-16, 04:30 PM
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Be sure to cap off the red/white wire of that dimmer.

Remove the two black wires off the switch as shown in the picture. Twist them together. Add a short piece of the same sized wire and attach that short tail to the switch on one screw. The second screw will be empty.

Now add the black wire from your dimmer to that splice of those three black wires.
The red only wire goes to your lights and the white of your new cable goes to the white neutral splice.

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Old 05-29-16, 05:02 PM
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Thanks, Pete! That picture of the left side is actually deceiving. There is only ONE black wire, going into the top screw. The bottom screw is empty.

I assume if I follow the rest of your directions, though, it should be okay?
 
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