How to fix a light that is always on

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  #1  
Old 03-25-12, 01:59 PM
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How to fix a light that is always on

I have an outside light fixture just outside my back door. If I put a light blub in it, the bulb stays on, regardless of the light switch position. The fixture just has a black and white wire coming out of it, attached to the matching color wires coming from the wall, so I'm guessing it is the switch wires/connections. I have replaced the switch itself and still have the problem. Here is an illustration of the wiring in the switch box:



Cables A and B come into the box from the same hole, whereas L comes in from the other hole in the box. [I realized I just assumed it would go to the light fixture based on positioning. It might not.]

Any help would be appreciated.
 
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Old 03-25-12, 02:08 PM
Tolyn Ironhand's Avatar
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Does the switch control anything right now? If not then it is wired wrong. I suspect cable B is your hot/neutral and the the blacks of cable A and L should be flip flopped.

If it does control something, you then have a couple of choices to make. I'll wait here.

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  #3  
Old 03-25-12, 02:10 PM
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No, the switch doesn't control anything. It's just for the outside light.
 
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Old 03-25-12, 02:23 PM
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I swapped the blacks of A and L and it works now. Many thanks for the help.
 
  #5  
Old 03-25-12, 03:34 PM
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Ok cool. That confirms that cable B is your hot and neutral. It doesn't really answer what cable A does, but I kind of assumed that is was just wired wrong. You may find something that used to work correctly now doesn't (like a light staying on like before) or something that didn't work now does. Post back if you find anything wrong and we can figure it out.
 
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Old 03-25-12, 03:50 PM
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> something that didn't work now does

Yeah, an outlet in the same room that didn't work before now works.
 
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Old 03-25-12, 04:04 PM
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Good! That makes perfect sense. Who ever wired it put the outlet on the switch instead of the light. Two birds, one stone.
 
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