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Old 04-15-2012, 09:33 PM   #16
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Adding Second Switch in Bathroom


What I think you have is white and black are hot and neutral coming in and going out to some other device. The red is switched power going back to the light. The power is originating at the light. Have you opened the light fixture and checked the wire connections up there?

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Old 04-15-2012, 09:53 PM   #17
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Adding Second Switch in Bathroom


I cannot recall the junction box at the light, will have to look tomorrow. There is more than just the light wiring in there. If the situation you described below is the case, what should I expect to see at the light? red connected to black of the light, and neutral connected to other neutrals in light junction box? Also, what do you mean "power originating at the light"?
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Old 04-15-2012, 10:03 PM   #18
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Adding Second Switch in Bathroom


Confirm that the black and white actually goes to the light. Disconnect the one black that comes into the switch box with the red wire leave the other black connected. If the light switches on and off then that confirms that the red is hot and black is the switched hot wire to the light. Once you prove that and I don't really see any other option adding a switch then is a simple deal.

EDIT: I just saw Joes response that is an option I had not thought about.

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Old 04-16-2012, 07:28 AM   #19
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Adding Second Switch in Bathroom


There could also be a junction box in the attic where cables from power, the light and the switch come together.
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Old 04-16-2012, 07:37 AM   #20
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Adding Second Switch in Bathroom


power originating at light:
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Old 04-16-2012, 07:40 AM   #21
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Adding Second Switch in Bathroom


adding another switch--incoming power at switch location
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Old 04-16-2012, 07:40 AM   #22
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Adding Second Switch in Bathroom


adding another switch--incoming power at light location
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