My 99 Mercedes ML320 low beam headlight do not work but my high beam lights do

Hey MJ, the high and low beams are not on separate circuits.. its the lights themselves or the switch

check for fuse for the low beam relays or relays

Do you have power in and out of the dimmer switch in the low beam position ?

I would start with checking the headlight bulbs (slim to none possibility but starting point) next go to the headlight switch.

You have separate fuses for high/low beams. Check that.

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5. How to Adjust a Mercedes' Headlights

How to Adjust a Mercedes' Headlights

In the U.S. the type, adjustments, and illumination factors of all automobile lighting devices are regulated by the Federal Motor Vehicle Safety Standard 108. The headlights must function and be adjusted correctly. Your high beams must disperse their beams straight forward and low beams down and to the right while safely providing illumination without too much or too little glare. It is wise to check the headlight adjustment on your Mercedes at least every year. Doing it yourself will save you time and money. It will also make driving safer for you and others you may meet on the road at night. All it takes is time, some basic tools and a little patience.
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Things You'll Need

• ratchet set
• 1/4-inch screwdriver, at least 8 inches long
• flashlight (if needed)

Show More Instructions

1. • 1 Open the hood and prop it up.
     
   • 2 Remove components if necessary to allow access to the left/right and up/down adjustment knobs. They are on top of the rear side of the headlight. The upper knob adjusts the beam to the left and right. The lower knob controls up/down adjustments.
     
   • 3 Park with the passenger side of the car parallel to a solid fence or wall and about four feet from it. When there is dim light or darkness, turn on the lights and use your screwdriver to adjust the up/down knob on the passenger-side headlight until the light beam is parallel to the ground (you can see the beam of light against the surface of the wall).
     
   • 4 Turn the car so that it faces the wall approximately one car length away. Adjust the up/down knob on the driver-side headlight until it is at the same level as the passenger side headlight. Then adjust both sides until the small groove on top of the beam cutoff is directly in front of the light.
     
   • 5 Reinstall any components that you removed. Close the hood.
     

Tips & Warnings

• This is method is generic for Mercedes models. Some may differ, as there are many models out there.
  

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Related Searches: References

• Mercedes-Benz Forum
• fixya.com: Technical Support, Manuals, Troubleshooting and Product Recommendations

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Comments

Your headlight switch has overheated and failed. It's common. The switch is $158 new and replacement requires airbag and steering wheel removal.

The wiring harnesses in the plugs behind the bulbs are burned up seperate rear of headlight cover and inspect parts available at your ford dealer

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

At first 1994 C280 high beams began to not connect regularly when stick pushed forward, then not at all. Drove high beams by pulling and holding stick back towards steering wheel until that stopped working, too. Shop said the turn signal switch was at fault-- had seen it many times before with W202; about $160 to replace. Haven't done it yet, but should be an easy fix?