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Discussion Starter · #1 ·
I have an '02 Impala, and the front bulbs needed replaced. Worked fine, simply no amber paint left on the bulbs. So, I went to eBay, bought a pair of these (LINK) and put them in.

Problem is, I can see inside that there are 2 sets of filaments, but only the small one is lit, so, the bulb is kinda dull compared to the old ones. I rotated the bulb 180' and tried it again but still just the smaller filament being lit.

Did I get the wrong bulb? shouldn't, if only 1 filament being used, the larger one be lit instead?


3157 Amber Color Chrome Light Bulbs Park Signal 3057
CROSS REFERENCE
3157 =
3057 3157 3357 3457 4157 (dual filament)
12V-27W
COLOR
Super Amber
FEATURES
Dye infused glass with chrome - will not fade
QUANTITIES
2 pcs Bulbs
 

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LIFETIME HILLBILLY
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6,197 Posts
It should be a 3457A bulb the A is front.

Low Beam Headlight Bulb Size: 9006 or 9006 HID Upgrade Kit
High Beam Headlamp Light Bulb Size: 9005 or 9005 HID Upgrade Kit
Parking Light Bulb Size: 3457ALL
Front Turn Signal Light Bulb Size: 3457ALL
Rear Turn Signal Light Bulb Size: 3057
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: Assembly
Fog/Driving Light Bulb Size: 896
License Plate Light Bulb Size: 194
Back Up Light Bulb Size: 921
Front Side Marker Light Bulb Size: 194
Rear Sidemarker Light Bulb Size: 194
Ash Tray Light Bulb Size: 194
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 194
Dome Light Bulb Size: 578
Step/Courtesy Light Bulb Size: 194
Trunk/Cargo Area Light Bulb Size: 912
 

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Discussion Starter · #3 ·
Ya but, the bulb says "3157 = 3057 3157 3357 3457 4157 (dual filament)"

When does the 2nd filament come into play?
 

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LIFETIME HILLBILLY
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When the turn signal is on or the hazzard lights.

I would say the chrome coating is why it isn't bright.
 

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Discussion Starter · #5 ·
I tried with both and from what I can tell, just the small filament for both... I'm simply confused as to what that 2nd filament is for. :S

Chrome isn't very heavy a coating... barely there at all on the sides. Maybe just crappy eBay quality.
 

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LIFETIME HILLBILLY
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I would say its due to low quality ebay bulbs along with a not so great coating to them. 1 filament should be lit when just the park lights are on and the 2nd filament only gets power when the signal is on sending power to the 2nd filament.
 

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Discussion Starter · #8 ·
Ha! I have that bookmarked. :D

Was confused because Amazon's description said it has a bright white light, but comments all said amber.

Though I have to wonder, is it amber glass? The old ones I had were Sylvania and still work great, but no amber paint left.
 

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I tried with both and from what I can tell, just the small filament for both... I'm simply confused as to what that 2nd filament is for. :S

Chrome isn't very heavy a coating... barely there at all on the sides. Maybe just crappy eBay quality.
1 for running light (or parking light)
one for turn signal.
 
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