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Discussion Starter #1 (Edited)
I'm trying to replace a 3 way switch with a dimmer. I have been learning as I go, but bought a few books to help with this. I don't see the answer in the books or when I searched here.

The first picture is the switch I removed, (that wire was pushed in and came out when I pulled on the switch). I have three black wires a red wire and a ground wire. Between the two black wires on the bottom of the switch, on the switch itself, it does say COMMON. There is no screw option opposite that black screw, just another brass screw at top.

The second picture is the Leviton decora slide dimmer 6674. I have installed a few of these so far, but this is the first and only 3 way going in. I know the green is ground. The red with the tag is supposed to only be used in a 3 way install. From the directions the remaining black and red can be interchanged to the two black wires, line or load.

My guess is that I use a wire nut and combine the two black wires (that are still fully seated) along with either black or red off the dimmer. The green is ground, the red wire from the dimmer goes to the black wire that came out of the switch, and the dimmer's red wire with tag goes to the switches red wire.

I have a multimeter if I need to test anything. There are three light sockets wired on this switch if that matters.



EDIT: I went and pulled the other switch on this circuit just to see, and it has one less wire in it. In the first pic, the bottom wire on the "far side" is not there. That's the one spot that has a push through, but no screw terminal.
 

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Naildriver
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What you are showing us in the first picture is a 4 way switch. You can install the dimmer you show in one of the other 2 locations that are three way, but not this one.
 

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Connect the two black wires at the COMMON end to the black on the dimmer.
Connect the the other black and red to the red wires on the dimmer.
 

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Discussion Starter #4
What you are showing us in the first picture is a 4 way switch. You can install the dimmer you show in one of the other 2 locations that are three way, but not this one.
There are 3 cables going into the box. There is no third switch though, it shouldn't be a 4 way switch.

If it was a 4 way switch, would it be a 4 way switch on the other one too?

Connect the two black wires at the COMMON end to the black on the dimmer.
Connect the the other black and red to the red wires on the dimmer.
Woo hoo, that's what I was hoping. Maybe I am learning something.



This circuit seems really odd to me. It goes to the hallway between the bedrooms. The light for both of the bathrooms, (the guest and master), but for the light and fan (only, not the outlets) in the bathroom, the utility room on the other end of the house, and the third bedroom light.

Lets say the house is a big square shape, this circuit is in the shape of a J and goes 2/3rd cross one length of the house, and all the way across the other length of the house, connecting every room in the house except the kitchen, entry way, and two of the bedrooms.
 

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There are 3 cables going into the box. There is no third switch though, it shouldn't be a 4 way switch.

If it was a 4 way switch, would it be a 4 way switch on the other one too?
If it was a four way switch it would have 4 screws and it would not say COMMON on it.
A four way switch is only used if more than two switches are needed. There will always be a three way at end. Four way switches go between the three ways. You can have as many 4 ways as you need, but there will always be a three way at each end.
 

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Naildriver
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I was going by the wire pokes, and didn't notice the screw.
 
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