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What is up with these bulbs
#846506 Wed Apr 25 2012 03:43 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
I have a set of the reproduction tail lights on my 49 gmc. Each tail light has two single filament bulbs inside. I am using bulbs that say 12v on the package, however, I can't seem to keep bulbs alive in one of the tail lights in particular. I check em, and they are indeed burned out when I change em. What the heck is up?

Re: What is up with these bulbs
50jimmy #846513 Wed Apr 25 2012 04:16 PM
Joined: Jun 2009
Posts: 2,269
F
Shop Shark
Are they burned out or broken filaments? Burned out would indicate an electrical problem, broken filament would indicate a vibration problem.


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Re: What is up with these bulbs
FriedGreenTmater #846515 Wed Apr 25 2012 04:20 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
hmmm. I will have to get the bifocals out to be sure.

Re: What is up with these bulbs
50jimmy #846532 Wed Apr 25 2012 05:23 PM
Joined: Aug 2005
Posts: 9,386
Ex Hall Monitor
Are the bulbs made in China? I bought a whole box of Chinese made headlight bulbs for my '38 (prefocus base) and none lasted more then a few seconds before burning out.


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Re: What is up with these bulbs
Tiny #846542 Wed Apr 25 2012 06:11 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
I have been getting them at the local auto parts places. I do think the packaging said sylvania....but also said made in china. None of them seem to last more than one or two rides.

Re: What is up with these bulbs
50jimmy #846553 Wed Apr 25 2012 06:53 PM
Joined: Sep 2003
Posts: 2,397
6
Shop Shark
I guess China doesn't seal the bulbs well enough, air gets in and poof. I work a parts store and the returns are crazy on China-made bulbs-many blow upon the first use. Chinese quality is lacking.


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Re: What is up with these bulbs
64fleetside #846796 Thu Apr 26 2012 02:38 PM
Joined: Apr 2001
Posts: 35
5
50jimmy Offline OP
Wrench Fetcher
That is what I am starting to think here. I also got a headlight from the same flaps that was not glue together squarely. It would not fit in the headlight retainer ring. Being out in the boonies, I gently nipped off a fraction of glass off the outer rim to make it fit. If I had been in town it would have gone back to the store forthwith.

Re: What is up with these bulbs
50jimmy #846820 Thu Apr 26 2012 04:15 PM
Joined: Dec 2009
Posts: 198
H
Shop Shark
You may by sending a shock wave to the bulb when you close the hood. Slamming the hood sends good jolt to the bulbs in some cars.


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