The technology of headlight is not much complex, but there are many chances that your headlight can stop working suddenly. For the driver, who drives at night, the issue with headlight can cause terrible trouble. If you face the problem suddenly on the road, you need to take a note on that and need to identify the actual reason of headlight failure first.
The method of headlight troubleshooting will depend completely on the specific issue that you are facing. Start by checking that whether one or two headlights are not working or whether the low or the high beam of the headlight has stopped working.
First, determine the exact problem. Are they just dim or not working at all, hard to see with at night, have water inside and so on. If they stop working completely, either you have a burned out bulb or a serious electrical problem. An electrical problem can be quite expensive and very much labor intensive to fix out, but this problem occurs very rarely actually. So, start it by looking at the bulb.
You can also unscrew out bulb at the back of the lens of the headlight on the latest models of the cars. After removing the bulb, inspect it properly. Does it burn out? Is it melted, black, or discolored? If so, you need to replace it with a new one. You can buy the replacement bulbs from your local automotive store. Insert this new bulb or the bulbs and make sure that you are not touching the glass part of the bulb with your bare fingers.
The grease that emits on our bare fingers can cause the bulb to wear faster or can even blow. After installing the bulb, you need to try the lights. If it still doesn’t light you have an electrical problem or any other serious issue. This should be referred to your local mechanic.
If only the High beam or low beams headlight doesn’t work, there may be a problem with the bulb. The reason can be a burned out bulb, or there may be the issues with the relay or switch of the high beam. In most of the cases where whether the low or high beam stops working, there may be some faults in the bulb or the control switch of the high beam or relay. In such cases, you need to replace the switch, the relay or the bulb itself.
If you find that there is only one headlight, which is not working properly, there can be the reason that the associated components or the wires are not working properly. This is a very common issue with the HID headlights.
If both of the headlights are not working, there must be some issue with the ground, power or just burned out old bulbs. Two bulbs usually don’t burn out at a time together. But as per rule, you need to check it first. Check the ground and power system and fix if you find any problem or otherwise you need to replace the bulb. There can be a wiring problem.
Headlights can stop working if there is water in your lens due to some crack, leak or if there is any hole in your car’s lens. You can remove the lens with a new plastic lens and drill a small hole carefully into the bottom part of the lens. Do it carefully and don’t hit the bulb. Just let the water run out and patch properly with silicone. Find the source of the water. You can also reseal the car lens with high-quality silicone, around the lens. If the problem still exists, this is better to replace the lens.
There are few reasons that the high beam headlights cannot work, these are:
This is the most common issue to rectify.
The blown fuse of the high beam headlight
Problem with the relay
HID generator failing
This is very much common with the HID or the Xenon headlights.
Other reasons are like wrong headlight bulbs, the problem with the headlight switch and more.
Low beam headlight not working
There can be the reasons like faulty fuses, bulbs, relay near the battery, a connector that connects to the holder of the headlight bulb, etc. If the low beam headlights not proper current it can stop working.
How to solve the issue:
You will usually have two solutions to these problems; one can you can call up the mechanic or can do it yourself. Fixing the wire problems or burned bulb is quite easy and can be done without any professional support. But there are few serious issues where you need to call up the mechanic as the issues can be resolved only with some major tools and the important equipment. If you have one headlight is working condition but the other stops working, the problem can be the burned bulbs. You need to replace the bulb of the headlight as you want to resolve the issue.
The best way to check that the capsule of your HID headlight is a bad condition; you need to remove first the bulbs carefully. Replace the bulb, which is in working condition with another one that is not working. If even the good bulb of the headlight fails to work or turn on, then there is a serious issue with the socket and should be resolved with a professional mechanic. If both headlights stop working, maybe the problem is in the wires, fuse or socket but not in the bulbs.
These are just the simple and most important steps that one can follow to know the issue with headlights and the right way to resolve it.