This may sound silly, but are you using the factory or OEM bulb.? I think these are those little bulbs in a small socket. Be wary of aftermarket replacements, they sometimes don't quite make the grade

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.