Are you sure that you put the right bulb in? Some of these bulbs look very similar, (like a 3057 and 3157 or 3156) but they are different. A customer came in with this problem and the problem was that they put a bulb with a single filament in when it was supposed to have a dual filament. the bulbs looked the same and they just grabbed them off the shelf instead of asking the parts guy what their vehicle called for.
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