tail light bulbs...

[nate87]

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.

[jesilvas]

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.

[nate87]

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.

[jesilvas]

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.

[codyryan07]

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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[nate87]

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.