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.
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.