Headlight Keeps Burning Out? Here's Why (and How to Stop It)
You just replaced that bulb a few months ago and it's dead again. That's not normal. A headlight bulb should last 500 to 1,000 hours. If yours keeps dying, one of these things is probably the cause.
You're Touching the Bulb
Oil from your fingers creates hot spots on halogen glass. Those spots overheat and crack the bulb prematurely. Always use gloves or a clean cloth when handling halogen bulbs.
If you already touched one, wipe it down with rubbing alcohol before installing. It takes ten seconds and can double the life of your bulb.
Voltage Problems
Your car's charging system should deliver about 12.6 to 14.7 volts. If the alternator is overcharging (pushing 15+ volts), it'll fry bulbs fast.
You can check this with a cheap multimeter at the battery while the car is running. If it's over 15 volts, the voltage regulator in your alternator is probably failing.
Bad Ground Connection
A corroded or loose ground wire causes resistance. That resistance creates heat. That heat kills bulbs.
The headlight ground wire usually bolts to the body or frame near the headlight. Check it for rust, corrosion, or looseness. Clean the contact point with sandpaper, reconnect, and tighten it down.
Vibration and Shock
If you drive on rough roads, potholes, or off-road regularly, the vibration can break bulb filaments faster. This is especially true for halogen bulbs.
LED bulbs have no filament and handle vibration much better. If vibration is your main issue, switching to LED might solve it permanently.
Cheap or Defective Bulbs
Not all bulbs are created equal. Super cheap bulbs from unknown brands can have thinner filaments or poor quality control. Stick with known brands like Sylvania, Philips, GE, and Osram.
"High performance" bulbs that advertise extra brightness often burn hotter and die sooner. The trade-off is brighter light for shorter life.
Moisture in the Housing
If water is getting into your headlight housing, it can short out connections or cause bulbs to crack from thermal shock. A hot bulb meets cold water and that's the end of it.
Check for condensation. If you see standing water or persistent fogging, the housing seal or a vent cap might be compromised. Fix the moisture issue first, then replace the bulb.
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