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I am confident either my bulb or ballast unit may not be working correctly. How can I tell for sure?Updated a month ago

If one of your headlights is still functioning correctly, try swapping the bulb from the malfunctioning side to the side that is still working. If the problem follows the bulb, then we know it its the bulb that needs replacing or ballast PIN alignment. If the bulb works correctly on the other side then it may be the ballast that needs replacing or ballast PIN adjustment.  

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