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Why Are My Headlights Not Working?
One evening, you get into your car after work, turn the key, and realize one of your lights isn’t working. It might just be a burnt-out bulb, but it could also be something more complex—like a faulty multifunction switch, a malfunctioning daytime running light module, a bad relay, or even a sensor issue. What’s going on?
### When Just One Light Is Out
In most cases, a single headlight going out is simply due to a burned-out bulb. Bulbs have a lifespan that depends on factors like vibration, usage hours, and the tungsten filament inside. If you drive a lot at night, your bulbs may wear out faster than if you mostly drive during the day. On average, a standard bulb lasts between 600 to 2,000 hours, which translates to about five to six years under normal use.
However, if you have xenon headlights, the situation can be more complicated. In addition to a faulty bulb, other issues might be at play:
- The bulb may have come loose
- The socket could be corroded
- The igniter might be failing
- There could be a poor ground connection or wiring problem
- The bulb itself may be cracked or leaking
### When Both Headlights Fail
It's rare for both headlights to go out at the same time. More often, the issue lies in the electrical system. A common cause could be a blown fuse, a faulty relay, a damaged module, or a worn-out switch. The wiring that connects the headlights to the battery can also become damaged or loose over time, causing both lights to fail.
Another possibility is a faulty dimmer switch. If only one beam works (either high or low), the switch may need to be replaced entirely.
### Inconsistent Brightness
If your headlights seem to flicker or change brightness unexpectedly while driving, it might point to a problem with your car’s charging system. A faulty alternator or a slipping drive belt can cause voltage fluctuations, leading to inconsistent lighting.
But there are also physical causes to consider:
- Dirty headlights that need cleaning
- Moisture inside the lens cover causing fogging
- Discolored plastic covers that reduce light output
- Misaligned lights that aren’t pointing correctly
Check the lens for dirt or moisture buildup, as these can reflect light back into the housing instead of outward. While cleaning might help, persistent issues could indicate a cracked housing allowing moisture to enter.
Headlights are not just for visibility—they’re essential for safety. Failing to address lighting problems can significantly increase the risk of an accident. Don’t wait until it’s too late.
To ensure your headlights are working properly, schedule a diagnostic appointment with DaSilva’s Auto Body. Contact our Naugatuck location today to set up a time. Your safety starts with clear, functioning lights.