3 Replies Latest reply: Apr 25, 2013 11:02 AM by Rob Ramirez RSS

Replacing dimmer - wires don't match


I have a Leviton Decora 6633 dimmer that I'm trying to install.


The existing dimmer switch controls a single ceiling lamp, and has two black wires comimg out of it. These wires are connected to one black and one white wire coming out of the wall box. There are no other wires in the wall box, so I'm guessing this is a switch loop.


All of the diagrams in the instructions that came with the 6633 show the nuetral (white) wire running through the wall box.


Do I simply connect the black from the dimmer to the black in the wall, and the untagged red from the dimmer to the white wire in the wall, or do I have the wrong dimmer for this project?


If it's the wrong one, can you recommend a dimmer model available in Canada that will work with the single white and singe black wires in the wall?



  • Replacing dimmer - wires don't match

    Anyone from Leviton have a suggestion?

    • Replacing dimmer - wires don't match

      Hi Rmaz

      I know this is very late and too bad no one from Leviton replied. Makes you think that they don't browse their own forums.

      I'll take a crack at your question. It there are only 2 wires in the box then you are correct - it is just sort of a switch loop probably originating from the light box and no neutral in the box. So power comes into the switch box and returns to activate the light. In this case - I would do as you suggested - connect the Black wire to the Black and the Dimmer untagged red wire to the white wire and the ground to a ground in the box. If you have a voltmeter, you could verify that the power is on the black and not coming on the white wire which would reverse your installation. I don't think you need a different dinner.

  • Replacing dimmer - wires don't match

    The color of the wires in your wall generally do not matter, the function does.

    The simplest way to look at this install is to use the same two wires that were attached to your old device and assign one to each of the black wires of the new dimmer, catalog 6633.

    That's all there is to it. there is no nuetral involved.