Dimmer will not turn light bulb on or off

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  #1  
Old 05-27-14, 08:05 PM
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Dimmer will not turn light bulb on or off

I'm connecting a dimmer.

There are four wires coming from the wall. 2 black (one is HOT). 1 White. and 1 ground.

There are four wires on the dimmer switch I bought. 1 black. 1 red. 1 green (ground). and 1 red (for three way switch).

I've connected the black (hot) wire from the wall to the black wire on the dimmer and the other black wire from the wall to the red wire on the dimmer. However, when I try to push on/on on the switch nothing happens.

I've verified that there is power coming to the wire on the wall (hence I know it is HOT).

What could be the reason?

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Old 05-27-14, 08:12 PM
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There are four wires coming from the wall.... two white and two blacks. The two whites stay connected and capped. We don't include ground wires in a wire count.

Now you have two black wires. One is hot and goes to the black of the dimmer.
The other black goes to the red wire. The red/white is capped off.
Connect the ground wire. Now test.
 
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Old 05-27-14, 08:23 PM
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I just tried that but no effect.

Black from the dimmer is connected to black on the wall

Red from the dimmer is connected to the other black on the wall

Green (ground) on the dimmer is connected to the copper (ground) wire on the wall.

Still I have same effect. One thing I have noticed after connecting the ground wires is that now both black wires coming from the wall become hot (when dimmer is connected). However, still when I push the dimmer button on/off it has no effect! I just bought the dimmer half hour ago.

Here is the latest image: imgur: the simple image sharer
 
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Old 05-27-14, 08:26 PM
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Keep the whites capped. If you connect the two black wires together(without the dimmer) that light works.... correct ?
 
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Old 05-27-14, 08:30 PM
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I've verified that there is power coming to the wire on the wall (hence I know it is HOT)
If you used a non contact tester then maybe, maybe not. Connect the whites to each other. Connect the blacks to each other. Does the light light up?

ECHO, Echo, echo
 
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Old 05-27-14, 08:32 PM
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If I completely disconnect the dimmer switch then the light still works. As a matter of fact, the light turns on all the time.

When you say "If you connect the two black wires together(without the dimmer)" do you mean the two black wires coming from the wall??
 
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Old 05-27-14, 08:34 PM
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Yes. Could be a bad dimmer. Swap the black you have connected to the dimmer black if you don't have a multimeter to determine which black is hot.
 
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Old 05-27-14, 08:37 PM
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If I connect the two black wires coming from the wall to each other (imgur: the simple image sharer) then the light DOES stay on.

Guess I'll just go get a new dimmer tomorrow morning. I'm gonna have dreams about this dimmer tonight though.
 
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Old 05-27-14, 08:38 PM
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See my edited reply above.
 
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Old 05-27-14, 08:40 PM
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"Swap the black you have connected to the dimmer black if you don't have a multimeter to determine which black is hot."

I'm not sure what you intend by that.

If you mean swap the black from the dimmer to the other black on the wall and red on the dimmer to the other black on the wall then yeah I've tried that as well and absolutely no effect on the lit light bulb.
 
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Old 05-27-14, 08:43 PM
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I thought you said the light did not come on with the dimmer attached.
 
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Old 05-27-14, 08:45 PM
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The light always stays on (even when i completely disconnect the dimmer).

In my testing I've been trying to push the on/off button on the dimmer or spin the dimmer to see whether it has any effect on the already lit bulb.
 
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Old 05-27-14, 08:57 PM
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The light always stays on (even when i completely disconnect the dimmer).
Then it isn't the dimmer. Most likely it is at the light. We need to see the wiring at the light.

If you included a picture of the wiring at the light I probably missed it because only one of your images loaded at a reasonable speed. You may need to reduce file size.
 
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Old 05-27-14, 09:03 PM
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Here is what the wiring at the light looks like: imgur: the simple image sharer

There are two whites (combined together), two blacks (combined together), and one red coming from the ceiling.

There are two wires in the light. So, I connected one to black and other to white.

Should I change something
 
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Old 05-27-14, 09:56 PM
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Something very strange like a third junction box. Maybe a receptacle in the same room as the switch. First just for conformation connect the black of the light to the red instead of the black. Reinstall the dimmer as you originally had it*. The switch should now work.

*Dimmer: Diimmer black to Line black. Dimmer red to Load black. White to white.
 
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