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Mercedes Benz ML320 Headlight Assembly

Tips on Troubleshooting the Mercedes Benz Ml320 Headlight Assembly

The headlight assembly of the Mercedes Benz Ml320 is designed to provide years of reliable performance, but when it does fail it can be quite a serious problem, especially if the lights give out while you're in the middle of the road. This is why it is important to constantly check the headlight and fix or repair it immediately once it starts to show signs of breaking down. In this guide, we'll list down the common types of Mercedes Benz Ml320 headlight assembly failure and how to troubleshoot them.

Headlight doesn't turn on

Oftentimes, a headlight assembly will refuse to turn on simply because of a burnt out bulb. The service life of headlight bulbs can vary from 1,000 to 2,000 hours depending on the quality of the bulb, though they can burn out earlier if the bulbs are constantly exposed to heat and moisture. Check if the filament inside the bulb and replace it if it has burnt out is damaged. If both headlights are not working, check the connecting wire systems, headlight relay, headlight switch, and other devices connected to the headlight assembly.

Dim headlights

On the other hand, the headlight might turn on but emit only a faint, dim light. Once this occurs in your vehicle's headlight, check if the parking lights, fog lights and other front end lighting are also dimming. If the problem is isolated to the headlight, a faulty bulb might be the cause of the problem. But if all of the other front-end lights are also experiencing the same problem, damaged wiring or a faulty alternator might be the culprit. In addition, check the headlight lens for scratches and yellowing. Dirt and dust particulates can erode away the headlight's surface and, coupled with exposure to ultraviolet rays from the sun, lead to the diminished illumination.

Fluctuating headlight brightness

If the headlight brightness starts to fluctuate when accelerating, there may be a problem with the car alternator. A damaged or worn alternator might not be able to send enough electricity to the car battery, causing it to gradually lose its charge and eventually go dead. Check the alternator wires and battery cables as well to see if they are in good condition. Replace any worn or damaged parts or wires as soon as possible.

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  • Tips on Maintaining the Mercedes Benz Ml320 Headlight Assembly 27 February 2013

    The Mercedes Benz Ml320 headlight assembly is designed to provide reliable performance for the entire life of the vehicle, but this doesn't mean that it is invulnerable to failure. Age, adverse temperatures, and other various factors can stress and wear the headlight assembly, but with proper use and maintenance, wear is significantly reduced and the headlight's service life extended. In this article, we'll share with you some tips on how to properly care for and maintain the headlight assembly of the Mercedes Benz Ml320.


    Regularly inspect the headlights for wear and damage.

    Ideally, the headlights should be inspected every time you take your Mercedes out on the road (most especially if you are going to be driving at night). First, check if all the bulbs are functioning normally; headlight bulbs tend to burn out after 1,000 to 2,000 hours of use depending on the type and quality of the bulb. Also, check for rust on the metal parts of the metal assembly, and sand or replace them if necessary to prevent the rust from spreading and cause further damage to the assembly.


    Remove any excess condensation inside the headlight.

    There are cases, particularly for those who live in constantly humid conditions, where droplets of moisture will form inside the headlight assembly. This is normal as it is due to differences in temperature inside and outside the assembly, and the condensation will eventually evaporate through the various openings of the headlight housing. However, or a clog in the openings will cause the moisture to become trapped inside the assembly and form a pool at the bottom of the lens. This excessive condensation may cause the headlight to dim or for the bulb to get damaged, so make sure to remove this excess moisture as soon as possible.


    Clean the headlights frequently.

    While they may look shiny and spotless once out of the dealership, dirt, mud, and road debris will stick to and scratch the lens surface into. Combined with the surface yellowing due to UV degradation from the sun, and your Mercedes' the sheen on your Mercedes' headlight lens will turn into a yellowish haze. Regular cleaning and polishing of the headlight lens can help prevent any serious scratches from road debris and abate wear from UV radiation. Just make sure, however, to use only mild cleaners and lint-free cloth or sponge when cleaning the headlights to avoid damaging the lens surface.