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Old 12-03-2018, 11:57 AM   #1
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Trying to repair utility light


Put a new 150W halogen lamp in this fixture and no light. Took the fixture apart and tested voltage from cord (OK). Tested the continuity of the lamp and lamp holder, and this is where it gets weird.

Lamp by itself: .003.
Lamp in lamp holder: 1 no continuity)
Lamp removed from holder, hot+neutral leads twisted together and meter probes touched to lamp contacts: .009

I'm not an electrician. Can anybody tell me why the light won't work?

Many thanks for your help, PW
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Old 12-03-2018, 04:00 PM   #2
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Re: Trying to repair utility light


Probably a bad bulb, especially if you touched it with bare fingers.
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Old 12-03-2018, 04:10 PM   #3
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Re: Trying to repair utility light


Sometimes depending on type of fixture, the tab in the light socket itself gets push down really far and doesn't make contact with the bulb anymore. Try pulling it up with a flat tip screwdriver, with power off of course.

If still no good, then maybe something is wrong with the internal wiring of the socket or the socket itself is bad. If that's the case, better to just replace the fixture.

As mention, use a sock when changing the halogen bulb. They don't like fingerprints. Just a suggestion.

Last edited by jmon; 12-03-2018 at 04:12 PM.
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Old 12-04-2018, 10:23 AM   #4
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Re: Trying to repair utility light


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Originally Posted by jmon View Post
Sometimes depending on type of fixture, the tab in the light socket itself gets push down really far and doesn't make contact with the bulb anymore. Try pulling it up with a flat tip screwdriver, with power off of course.

If still no good, then maybe something is wrong with the internal wiring of the socket or the socket itself is bad. If that's the case, better to just replace the fixture.

As mention, use a sock when changing the halogen bulb. They don't like fingerprints. Just a suggestion.
I'll give pulling up the tabs. I always use a kleenex or rag when changing halogen lamps. Many thanks for the help.
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Old 12-04-2018, 10:28 AM   #5
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Re: Trying to repair utility light


Quote:
Originally Posted by jmon View Post
Sometimes depending on type of fixture, the tab in the light socket itself gets push down really far and doesn't make contact with the bulb anymore. Try pulling it up with a flat tip screwdriver, with power off of course.

If still no good, then maybe something is wrong with the internal wiring of the socket or the socket itself is bad. If that's the case, better to just replace the fixture.

As mention, use a sock when changing the halogen bulb. They don't like fingerprints. Just a suggestion.
JMON...Thanks... never thought of a sock... has to be easier than paper towels.... especially when you're atop the ladder
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Old 12-04-2018, 09:58 PM   #6
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Re: Trying to repair utility light


Probably not related, but I have found that some moulded rubber lamp sockets don't play nice with some bulbs. When I was temporarily wiring a barn, I used some pigtail sockets and found that certain incandescent bulbs wouldn't screw in far enough to make contact. Different manufacturers have slightly different shapes to the bulb part. Drove me nuts.


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Old 12-06-2018, 01:50 AM   #7
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Re: Trying to repair utility light


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JMON...Thanks... never thought of a sock... has to be easier than paper towels.... especially when you're atop the ladder
I tried using a sock but fell off the ladder when I lifted my foot up to the light...
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Old 12-19-2018, 06:35 AM   #8
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Re: Trying to repair utility light


Maybe because of the bulb or the socket itself.
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Old 12-21-2018, 02:56 PM   #9
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Re: Trying to repair utility light


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Originally Posted by Seattle2k0 View Post
Probably a bad bulb, especially if you touched it with bare fingers.
Touching it simply transfers oil that can then make the glass crack when the halogen bulb get's hot.

Just touching the bulb does not make it go bad immediately.

Most likely, one of the wires is crimped to a lug that is riveted to a contact. The rivet has become loose/corroded due to the thermal expansions and contraction. I've sometimes used silver solder and made that mechanical joint (the rivet to lug) permanent. Silver solder takes the heat better than standard solder. YMMV.

Last edited by Domo; 12-21-2018 at 02:59 PM.
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