I've got a 2010 300c with stock HIDs. I bought a new set of D1s 10000k bulbs but I've had 1bulb kinda go out. It turns on quickly then off and doesn't stay on. I exchanged the bulb for a new one and the new worked for a week then did the same. Is it an issue with "cheap" bulbs or a ballast issue? I've checked all the connections and they are all solid. I've swapped the bulb to the other headlight and it still doesn't work. My factory bulbs do work.
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