Headlights that are dim, flickering or out usually have one of five causes: the bulb, the socket, a relay or fuse, a bad ground or wiring damage. Testing finds which. A recent reviewer describes a quick, fairly priced headlight and taillight repair on a Prius at Peña's.
Key takeaways
- Start with the bulb and fuse.
- Dim lights often point to grounds.
- Valley fog makes working headlights a safety issue.
Bulbs and sockets
Bulbs wear out and sockets overheat, melt and corrode. A bulb that burns out repeatedly suggests a socket or voltage problem.
Fuses and relays
A blown fuse or failing relay can take out both headlights or one. A fuse that blows again is a sign of a short.
Grounds and wiring
A corroded ground connection makes lights dim or flicker. Wiring damage from heat or rodents does too.
Fog, night driving and the law
Winter valley fog and dark rural roads around Bakersfield are the conditions where low beams matter most. Driving with a headlight out can also draw a stop.
Taillights and brake lights
These have the same circuit problems and matter just as much. If one fails, check the others.
Halogen, LED and HID differences
Many cars use halogen bulbs that are cheap and simple, while newer cars use LED or high-intensity discharge systems with ballasts or modules that cost more to replace. A dim light can be as simple as an aging halogen bulb or as complex as a failing module. Knowing which type you have helps predict the repair. Tell us the year and model so we can estimate before you visit.
Aim and cloudy lenses
Even working bulbs can light poorly when lenses are yellowed or foggy, or when the aim is off. Foggy lenses scatter light, and misaimed beams light the trees instead of the road. A headlight check can include lens condition and aim. In valley fog, correct aim and clear lenses are as important as bright bulbs, because low beams cut through fog better than high beams.
Need help in south Bakersfield?
Questions about auto electrical repair? Read our Auto Electrical Repair page, call (661) 599-9098 or request a time. Peña's Auto Electric, Smog & Repair, 303 Taft Hwy, Suite B, Bakersfield, CA 93307. Mon to Fri 9:30 AM to 5:30 PM, Sat 8 AM to 1 PM.
Frequently asked questions
Why are my headlights dim?
Bad grounds, aging bulbs or charging problems.
Why do lights flicker?
Loose connections or a failing alternator.
Do you fix taillights too?
Yes.
Do you replace headlight housings?
Call us with your vehicle.