Aiming head lights on a 01 379 need measurements for aim points

Discussion in 'Peterbilt Forum' started by Mr. Cob, Feb 5, 2019.

  1. Mr. Cob

    Mr. Cob Light Load Member

    Howdy All,

    The head lights on my 379, are in dire need of proper adjustment. I have looked all over the net and can't find the information I need to do this job.

    For most vehicles there is a measurement from the ground up to a certain point and from the head light to the surface being used to aim the lights on. For example the ground up measurement might be 42 inches, the distance from the head light to the wall might be 30 feet.

    If anyone knows the proper measurements and can post them up I sure would appreciate it, thanks.

    Dave
     
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  3. Snakeschasingcars

    Snakeschasingcars Heavy Load Member

    743
    1,568
    Mar 22, 2018
    0
    Just do what everyone else seems to do. And point them right into on comming drivers eyes. Oh and leave brights on all the time.
     
    Brettj3876 and Ffx95 Thank this.
  4. x1Heavy

    x1Heavy Road Train Member

    34,017
    42,098
    Mar 5, 2016
    White County, Arkansas
    0
    Find a wall, get a pair of screwdrivers, find the adjustment points on them things adjust them until you are happy with it.

    The day that enforcement goes nuts over headlights that blind everyone coming on is a black day indeed. Until then just wall em and be happy.
     
    KB3MMX Thanks this.
  5. King Michael

    King Michael Light Load Member

    89
    72
    Nov 20, 2018
    0
    Aiming headlights is simple and shouldn't take more that 30 minutes
    Done in a shop (so sunlight doesn't interfere is best)
    Procedures for the DIY mechanics 4 headlight system...
    1. Make sure your suspension is fully aired up.
    2. Make sure truck is level and facing a wall or something similar.
    - distance should be 6' to 8' or less.
    3. Have several towels or rags available.
    **** measurung distances ...
    LOW BEAMS
    A. Measure on truck, center to center between low beams. (example 63 inches)
    Measure from the ground to center of low beams (example 36 inches)
    B. On a wall, mark your width, then your height (you may have to mark and measure several times on the wall until you get the exact center between height and width for each low beam.)
    C. Do this for both sides.
    (ultimately you should have 2 "x's" on the wall. One for the right side and one foe the left side)
    4. Cover left lowbeam with rag/towel.
    5. Turn on headlights (high beams off)
    6. Adjust right lowbeam until it hits the height width mark on the wall.
    7. Now cover right lowbeam
    8. Uncover left lowbeam and adjust until it hits your height width mark on the wall.
    HIGH BEAMS
    1. Cover low beams
    2. Cover right high beam
    3. Adjust left high beam until it hits just INSIDE height / width measurement on the wall for left lowbeam
    4. Cover left high beam
    5. Uncover right high beam
    6. Adjust right high beam until it hits just INSIDE the height /width measurement on the wall for the right lowbeam.
    ****uncover all lights
    Sit in cab and switch back and forth between your high and low beams while smiling
     
    KB3MMX, xsetra and Mr. Cob Thank this.
  6. King Michael

    King Michael Light Load Member

    89
    72
    Nov 20, 2018
    0
    Aiming headlights is simple and shouldn't take more that 30 minutes
    Done in a shop (so sunlight doesn't interfere is best)
    Procedures for the DIY mechanics 4 headlight system...
    1. Make sure your suspension is fully aired up.
    2. Make sure truck is level and facing a wall or something similar.
    - distance should be 6' to 8' or less from edge of lights to the wall.
    3. Have several towels or rags available.
    **** measurung distances ...
    LOW BEAMS
    A. Measure on truck, center to center between low beams. (example 63 inches)
    Measure from the ground to center of each low beams (example 36 inches)
    B. On a wall, mark your width, then your height (you may have to mark and measure several times on the wall until you get the exact center between height and width for each low beam.)
    C. Do this for both sides.
    (ultimately you should have 2 "x's" on the wall. One for the right side and one for the left side)
    4. Cover left lowbeam with rag/towel.
    5. Turn on headlights (high beams off)
    6. Adjust right lowbeam until it hits the right side height width mark on the wall.
    7. Now cover right lowbeam
    8. Uncover left lowbeam and adjust until it hits your left height width mark on the wall.
    HIGH BEAMS
    1. Cover low beams
    2. Cover right high beam
    3. Adjust left high beam until it hits just INSIDE left height / width measurement on the wall for left lowbeam
    4. Cover left high beam
    5. Uncover right high beam
    6. Adjust right high beam until it hits just INSIDE the right height /width measurement on the wall for the right lowbeam.
    ****uncover all lights.
    **** make any fine tuning adjustments
    ***** FYI... Nothing should be between the truck and wall. Wall should be flat and level. Ground should be flat and level.
    Sit in cab and switch back and forth between your now properly adjusted high and low beams while smiling
     
    Mr. Cob Thanks this.
  7. Mr. Cob

    Mr. Cob Light Load Member

    Howdy King Michael,

    Thanks for the detailed explanation of how to do the head light aiming.

    Dave
     
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