I have a 2013 FX4 with oem halogen bulbs. The driver's side beam shines very high. However, turning the white gear at the top of the light doesn't cause it to move at all. The passenger side moves as expected, but the driver's side is stuck because it won't react to the turning of the gear in either direction. Any advice? Should I disassemble the entire thing? Buy another headlight? TIA.

 

The gear might be stripped. I think you can replace that white piece however... do a google/youtube search