What's up guys. I am new to the forum and my first F150. I recently bought a 06 F150 Lariat scab 4x2 with a 5.4L. I am having a problem with the driver side head light. It comes on but not all the way on (shines but VERY dim). The low beam works correctly sporadically. I haven't done any trouble shooting yet because I haven't had a day off. I did replace the bulbs today thinking I had a loose filament maybe. Don't usually do shotgun maintenance but wanted to put xenon's in anyway. Was wondering if anyone had similar problems in the past before I started ripping and tearing into it. Thanks in advance.
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Check to make sure there is proper power coming through the wires to the bulb if your problem still exists.

 

Sounds like a bad ground.