tail light bulbs... - Ford Powerstroke Diesel Forum

 
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post #1 of 6 Old 03-11-2012, 10:24 AM Thread Starter
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tail light bulbs...

ok, so i bought some 3157 tail light bulbs from recon for my 99. i got the number 3157 from rock auto, but i found some of my tail light bulbs layin around that are 3156...i dont want to think i wasted money on these things and now have to try and return or sell them, so will these things work? my truck isnt near me right now so i cant try exactly for another couple days, i noticed on the 3157 its got two extra wires where it connects up, so does it make a difference or what? thanks for the help yall.

Nate

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S480, swamps big fuel, swamps tuning, and other go fast stuff.
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post #2 of 6 Old 03-11-2012, 10:46 AM
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They should be 3157. 3156 is just a single filament bulb. Just bright is all it has.
3157 is dual filament. Dim for running lights and bright for turn signals.



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post #3 of 6 Old 03-11-2012, 11:08 AM Thread Starter
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Wow so thank you to the guys at advanced auto parts for getting me the right bulbs. Chances are, I would have the blinker on but when I would hit the brakes no blinker. Cool, thanks for the info.

Nate

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post #4 of 6 Old 03-11-2012, 11:28 AM
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Brakes are blinker. They use the same filament. So I'm not sure which would take over. Mainly because the base of a 3157 is a dual contact base for the two filaments, and the 3156 is a single contact base with the outer housing ground for both bulbs.



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post #5 of 6 Old 03-11-2012, 12:00 PM
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The 3157 is going to be used for your brake/blinker bulb.. the 3156 is the one used for the reverse lights. I believe they interchange but it won't function properly without the dual filament.

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post #6 of 6 Old 03-11-2012, 02:12 PM Thread Starter
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ah, maybe thats why i bought them. its been over a year and then some and even a move to a new house... oh well thanks guys.

Nate

99.5 7.3 Crew Cab short bed 4r100
S480, swamps big fuel, swamps tuning, and other go fast stuff.
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