Hi, after reading some of the posts on this subject WHAT IS THE CORRECT PROCEDURE FOR ADJUSTING is it turn bolth screws at the same time and direction for verticle then adjust horizontal with the just outside alone----or is it----- turn the inner screw for vert and outer for horiz.

It is very easy.

Just adjust each light and each adjustment (up-down / left-right) one at a time. The key is to mark your test screen (for me a garage door) accurately AND to have 25 feet between the lights and the test screen.

If you have any questions, just pull out your owner's manual and follow the instructions. The part about using a level requires a special tool. For me, I just marked the height of the lights and then used that mark for my vertical (up-down) target. After that I just did a little test drive and made a few minor adjustments from there.

If this sounds too difficult, then just take it to the dealer. Should be less than $100.

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Bi Xenon Light Upgrade

I recently upgaded my lights in my 2001 ML 320.I was told that my vehicle does not have the auto adjust so my lights are aiming high is there a way to adjust them.

In the manual there are directions for how to adjust the bi-xenons. It appears you have to remove the light assembly and adjust the levels that rotate clockwise/couterclock.

Don't remove the lights - they are adjusted while in the car. There are two white adjusting screws on top of the headlights, one for vertical and the other for horizontal alignment. They can be adjusted with a Philips-head screwdriver. Follow the instructions in your 2001 manual; the procedure is more or less the same (except for the part about the bubble in the water-level that is built into pre-02 headlights; your bi-xenons don't have those). Make sure you have a flashlight handy - those adjusters are hard to see in the dark.

You can also find good instructions here:
http://www.danielsternlighting.com/tech/aim/aim.html

I agree with your post but avoid using a philips screw driver especially if its not the right size. The proper tool is a 6mm hex wrench better known as allen wrench. Get a longer one so that will bea easy to turn.

Yes, I upgraded my headlights to Bi-Xenons on my 2001 ML, too.

Just get the right bit on your thin bit driver (if your bit adapter is too wide, then it will not slide/fit into the screw hole) and adjust both screws. One screw is for up/down, and the other one for "right/left". It has been a long time so I can't remember, you can search on the forum.

Best is to take it to the dealer, they can adjust it in a snap and regardless of the auto leveling not working. It is hard to get it right otherwise. If you do it yourself then make sure that the hot spots aligned/converge at the right distance in order to get the correct bright ilumination.

(rear of bi-xenons .jpg)

(halogen_01.jpg)

(3283237818200234048PM.jpg)

(3283237818200234115PM.jpg)

(3283237818200234139PM.jpg)

Aim.pdf (145KB - 11 downloads)

headlight alignment - 01.pdf (97KB - 18 downloads)

headlight alignment - 02.pdf (49KB - 9 downloads)

How To Aim Headlamps and Auxiliary Lamps.pdf (145KB - 8 downloads)

rear of bi-xenons .jpg (81KB - 5 downloads)

halogen_01.jpg (44KB - 8 downloads)

3283237818200234048PM.jpg (65KB - 5 downloads)

3283237818200234115PM.jpg (58KB - 4 downloads)

3283237818200234139PM.jpg (39KB - 7 downloads)

Automotive lighting FAQ - Headlamp aiming.pdf (15KB - 11 downloads)

Don't bother with the leveling motors .... the motors, sensors,etc.... are damm expensive , and not worth the effort .... non of the members doing the conversions have fitted them.

As for the "the bi xenons need a HID conversion kits right?". I am not aware of any such kit. All you need are the headlights, pigtails for older ML's (optional if you don't want to mess with the wiring), and the earth wire cross link (older ML's don't have an earth on one of the pins - see andy's mod further up)

I did my alignment myself. Just drive up to a nice white wall in the dark (one that you can draw on). See info above for details

PS: I figured out my pin re-arrangment by trial and error (trying combinations with the lights on).

Xenon conversion kits:

http://www.lighting-hub.com/mecedes-benz-light-bulb.html

http://www.lebleu.de/bi-xenon.html

http://faqlight.carpassion.info/hl-general.htm

http://www.lucklighting.com/carlighting/