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Help with aiming headlights ~ GMC Yukon XL

Discussion in 'Lighting Discussion' started by Pikey, Oct 21, 2012.

  1. Pikey

    Pikey Moderator Staff Member 1000 Posts

    I bought a set of GM OEM Denali headlights for the yukon xl today. I installed them and am attempting to get them aimed properly. I know @SurrealOne has done this with his lights. (No LMGTFY please Surreal!:no:) I did google it and that is how I came to this point. Here are my questions, How do I know what height to set them at as a baseline? How do I know that they are at the correct angle (left and right) I don't want to blind other drivers but if they are to low then I am losing out on distance. I put them in and pulled up to the garage door. I made sure the cutoff was even for both lights. I then put piece of tape at the top of the cutoff. Then I put a piece of tape 2 1/8" below that piece. I backed up 25 feet and the cutoff hits right at the top of the lower line. Perfect as DOT specifies a 2.1-2.5" drop over 25 feet. But, if my base height is incorrect then it is all off anyway. I also noticed at 25 feet the cutoff does not line up perfectly like it did at 1 foot. the drivers side cutoff seems to slant down toward the passenger side a small amount. I have not messed with the other adjuster because I have to take them in and out every time and did not have time tonight. Any help would be appreciated! Thanks
    Last edited: Oct 22, 2012
  2. SurrealOne

    SurrealOne Former Member 1000 Posts

  3. Pikey

    Pikey Moderator Staff Member 1000 Posts

    Thanks [MENTION=50075]SurrealOne[/MENTION] . That is much better than the crap I found searching google.
  4. SurrealOne

    SurrealOne Former Member 1000 Posts

    It's the first thing that comes up when one searches for 'how to aim headlights' and yes, it's thorough -- but Popular Mechanics' stuff usually is. This begs the question of what the heck you were searching for...
  5. Pikey

    Pikey Moderator Staff Member 1000 Posts

    lol! I have no idea. Apparently I was drunk. Which is odd because I did not drink at all that day!!!
  6. SurrealOne

    SurrealOne Former Member 1000 Posts

    Methinks I should have responded with another lmgtfy link, initially. :)

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