What is the reason for car headlights not working?
2 Answers
The reasons for car headlights not working are: 1. Circuit failure, due to poor or loose connections in the wiring; 2. The circuit breaker in the line trips or burns out; 3. Poor contact or non-closure of the bimetal contacts in the light switch. The solutions for car headlights not working are: 1. Remove the brake light bulb and check the filament; 2. If the filament is intact, while pressing the brake pedal, use a screwdriver or wire to scrape the brake light live wire terminal against the ground. Car headlights, also known as car front lights or car LED daytime running lights, serve as the eyes of the car. They not only relate to the external image of a car owner but are also closely linked to safe driving at night or under bad weather conditions.
I've been in auto repair for many years, and there are several common reasons why headlights don't work. The most common is a burnt-out bulb—the filament tends to break after prolonged use. Next is a blown fuse, usually located in the fuse box under the steering wheel; it breaks when the current is too high. Wiring issues are also critical, such as short circuits or open circuits—poor contact can prevent current from reaching the bulb. I recommend shaking the connector first to check. Faulty relays or switches can cause the lights to not turn on at all; sometimes, you can open them up to inspect the contacts. If the alternator voltage is too high, the bulb can burn out easily—you'll need to test the voltage regulator. Non-functioning headlights are very dangerous, especially at night, so pull over as soon as possible to replace the bulb or go to a professional shop for repairs to avoid accidents. During regular maintenance, remember to check the condition of the lights to prevent problems before they occur.
