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I used a garage door to get mine somewhat even, then found a dark flat parking lot at night and made my final adjustments. They may not be in spec, but they are right where I want them.
Like others have said, garage door. I thought I had mine spot on but everybody was flashing me at night (with their lights, get your mind out of the gutters) so I just went down a few inches and was right on.
I drive my car down a level, flat street until I know I am headed directly down it.
I then flip on my high beams and cover one of the headlights with the towel, leaving only one to aim straight down the street, illuminating everything as far away as possible.
Then I move the towel to the other side and do the same thing, and then remove the towel.
Then I flip on the low beams to ensure they are going down and to the right.
If it looks like they are still throwing too much light to the left, or too high, I make some small adjustments, but it usually isn't too extreme.
Flipping back and forth a few times will give you an idea of whether they are right or not.
I don't have people flashing theirs at me to indicate they are mis-adjusted, so I must be close.
Pull up as close as you can to a wall. Mark the center of each light on the wall. Back off 25 foot, then adjust each light to be centered on the mark and the top of the light beam 2" below the mark.
call the local body shops they have the equipment to set them right. and from my experience they don't charge that much
I had an interesting experiance a while back with a body shop doing mine.
Their shop is kinda small, oriented towards small import cars, they pulled my CC 8' bed DUALLY in there and adjusted the lights-mind you the rear wheels were outside the shop on the slope.
When I turned my lights on later they were shineing about 5' in front of the truck.......no lol!
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