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Old 05-06-2012, 08:51 PM   #1
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Wiring issue....I think


Hello,
In our master bathroom, we have a light fixture that holds six bulbs lined up in a row. I turned the lights on and a spark flew out of one side, and all of a sudden, three sockets on the left no longer function. Any ideas?
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Old 05-06-2012, 08:53 PM   #2
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Sounds like something shorted out and blew a splice apart behind the fixture.
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Old 05-06-2012, 08:57 PM   #3
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So if I take it off the wall and tighten everything up, it should work again?
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Old 05-06-2012, 08:59 PM   #4
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Probably, the curious part is that if it did short out, why didn't the breaker trip?
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Old 05-06-2012, 09:02 PM   #5
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Good question. I'll take the thing off the wall and see what's going on behind it.
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Old 05-06-2012, 09:05 PM   #6
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There's going to be 6 white and 6 black wires all connected together to link the bulbs together that all get connected to the black and white wires from the incoming power wires so it's easy to not have all of them connected nice and tight.
You need to kill the breaker to this light. Right now you have a dead short.
Most of those style lights have to have the bulbs removed in order to get the cover off. Look fo any pinched wires around the cover.
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Old 05-06-2012, 09:57 PM   #7
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Quote:
Originally Posted by k_buz View Post
Probably, the curious part is that if it did short out, why didn't the breaker trip?
Sometimes it happens. Weakest link always acts like a fuse and will blow before the fuse blows. Works the same as the fusible link on your car's DC voltage system.



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Old 05-07-2012, 07:28 AM   #8
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You will need to test the fixture for shorts with the lamps removed. While unscrewing the lamps check for the glass bulb being loose from its screw base where small wires inside get twisted togethere which is often the cause of shorts in light fixtures.

Use the ohms or continuity function of a meter. Nearly zero ohms between black and white after all loads are removed indicates a short. For these functions power must be off and at least one of the two places you touch the meter probes to must not be connected to anything other than the test subject (unhook the fixture wires from the cable wires going into the wall).
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Last edited by AllanJ; 05-07-2012 at 07:36 AM.
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