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Old 12-22-2008, 07:15 PM   #1
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Dimmer Switch On other lights off.


I have a 3-way dimmer with what should be a 3-way circuit. In the light switch i have a ground wire, tied neutral wires, two black (non-hot) wires, and one hot wire. When i installed the dimmer it turned on/off and dimmed the light in the room but other rooms in the house go out when the dimmer is turned on. Any help is appreciated...Thanks in advance.

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Old 12-22-2008, 07:29 PM   #2
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Dimmer Switch On other lights off.


May we assume that the lights that go out when the dimmer is turned on are all on the same circuit?
Did this only start to happen when you installed the dimmer?

First thing I would do is check the tied neutral wires. Check to see if the wirenut is tight, and that both wires are secured under the nut.
Situation like you describe sounds like an open neutral.

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Old 12-22-2008, 07:39 PM   #3
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Dimmer Switch On other lights off.


neutrals are tied and before i had just a regular switch and no problems (same circuit)
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Old 12-22-2008, 08:06 PM   #4
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Dimmer Switch On other lights off.


Quote:
I have a 3-way dimmer with what should be a 3-way circuit

Keyword, should.


#1 Did you for sure have a functioning 3 way circuit in place before you tried to add the dimmer?

Did you take things apart without labeling them

You obviously tied a power out wire to your switch leg.

Describe the wiring in detail. Romex or conduit? Color of the wire you say is hot?


Quote:
other rooms in the house go out when the dimmer is turned on
Wait....when the dimmer is turned ON, the other rooms go off???

That aint right. Put down the crack pipe and give more detail.

Last edited by 220/221; 12-22-2008 at 08:08 PM.
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Old 12-23-2008, 08:27 AM   #5
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Dimmer Switch On other lights off.


220/221, I think you've hit on the problem!
As you highlighted "should" be a 3-way circuit.

He must have had a regular switch, where one of the non-powered blacks was wired with the powered black, feeding the other part of the circuit.
Now, when he wired it with a 3-way switch, putting one of the non-powered blacks on each of the switched screws (I forgot the color coding, black screws, brass screws), and the powered one on the switch common screw.

Now, he has a situation where when the switch is in one position, the light that is supposed to be on the 3-way circuit turns on, but the other part of the circuit is de-energized.

Should be a simple switch with one of the un-powered blacks connected to the powered one on the non-switched side.

So, all you've got to do is determine which of the non-powered black wires goes to the light you want the switch to operate.
Connect that black wire to one side of the switch.
Then, connect the two remaining blacks (one powered, one not) together with a black pigtail wire to the other terminal on the switch, which should be a standard on-off, not a 3-way.
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Last edited by KE2KB; 12-23-2008 at 08:32 AM.
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Old 12-23-2008, 10:47 AM   #6
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Dimmer Switch On other lights off.


So, all you've got to do is determine which of the non-powered black wires goes to the light you want the switch to operate.
Connect that black wire to one side of the switch.
Then, connect the two remaining blacks (one powered, one not) together with a black pigtail wire to the other terminal on the switch, which should be a standard on-off, not a 3-way
.(Thanks KE2KB & 220/221)
Got up this morning and had it working in about 5 minutes. Thanks for the help/suggestions and the quick responses. Merry Christmas to everyone.

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