What are the reasons for the car's high beam not working?
2 Answers
Car high beam not working reasons are: 1. Relay or fuse failure; 2. Bulb filament burnout; 3. Poor wiring connection or open/short circuit; 4. Circuit breaker tripped or burned out; 5. Grounding issue causing bimetallic strip contacts to open; 6. High beam switch damage; 7. Generator voltage regulator set too high. Solutions for car high beam not working: 1. Open car fuse box, check relay and fuse condition; 2. Remove high beam bulb, check filament integrity; 3. Inspect headlight combination switch and wiring; 4. Check if generator voltage regulator is set too high.
I've been driving for many years and have seen plenty of cases where the high beams don't work. The most common reason is a burnt-out bulb—when the filament breaks, the current can't pass through, especially during long drives when the heat buildup is significant. It could also be a blown fuse; just open the engine compartment's fuse box, locate the corresponding position, and replace it to fix the issue. Loose or corroded wiring connections can cause poor contact, which is more likely in areas with heavy rainfall. Another possibility is a faulty high-beam switch or relay—try twisting the switch a few times to see if it's stuck. Not fixing it promptly is very dangerous; at night, you won't be able to see obstacles or pedestrians ahead clearly, and by the time an accident happens, it's too late. Once, while driving on a rural road, my lights suddenly went out, scaring me into a cold sweat. The next day, I rushed to the repair shop to replace the bulb. I recommend checking the aging condition of the lamp sockets during regular maintenance to avoid being caught off guard.
