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I have a 4 gang switch box with one 3-way switch and three single pole switches. When the 3-way is flipped on, all the other switches can turn their lights on and off. But when the 3-way is flipped off, none of them work.

I have them wired the same way as a 2 gang switch box with two 3-ways in it that work independently of each other.

All the white wires are tied together. The red from the 12-3 goes to the 3-way switch. The black from the incoming power pigtails to all 4 switches, and the black from each fixture goes to each respective switch.

What is wrong? Can I run three single pole switches and one 3-way off the same power source?? I covered up my walls...

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A diagram of your current wiring would help. –  BMitch Nov 29 '13 at 2:14
    
First glance, it sounds like you have common and a traveler reversed on the 3-way switch. Are you absolutely certain of which line the incoming power is? Otherwise agreed with BMitch: a diagram and/or annotated picture would help. –  gregmac Nov 29 '13 at 2:50
    
Sounds like the black bringing the power to all four switches is connected to the three way switch instead of the pigtail. If you have a non-contact voltage tester or voltmeter you can test to check this. –  getterdun Nov 29 '13 at 9:17
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