Why Do Car Taillights Flash?
2 Answers
Taillights flash due to reasons such as a burnt-out taillight bulb, severely worn brake pads, or insufficient brake fluid in the vehicle. Taillights: Taillights are white lights installed as close to the rear of the vehicle as possible, displaying a continuous light. Taillight Classification: Based on form, they can be categorized into independent, combined, and composite taillights. Light Distribution Performance: Rear position lights must meet the requirements of "GB5920 Photometric Characteristics of Front Position Lamps, Rear Position Lamps, End-outline Marker Lamps and Stop Lamps for Motor Vehicles and Trailers." Rear turn signals must comply with "GB17509 Photometric Characteristics of Direction Indicators for Motor Vehicles and Trailers." Rear fog lights must satisfy "GB11554 Photometric Characteristics of Rear Fog Lamps for Motor Vehicles and Trailers." Reverse lights must adhere to "GB15235 Photometric Characteristics of Reversing Lamps for Motor Vehicles and Trailers." Retro-reflectors must meet "GB11564 Retro-reflectors for Motor Vehicles."
I think the flashing of car taillights is usually due to electrical system issues. The most common causes are burnt-out or loose bulbs. Over time, the vibration from driving can cause the bulb sockets to become misaligned, leading to poor contact. Blown fuses are also critical—when the circuit current is too high, they break to protect the system, resulting in flickering lights. If the alternator voltage is unstable, the current fluctuates, causing the lights to flash, especially in older cars where the battery charges quickly. Short circuits are another factor, where aging or cracked wires or corrosion from rainwater can disrupt the signals. I recommend first checking the fuse box and bulb sockets yourself—tightening or replacing them if needed. If the problem persists, get it fixed immediately. Taillights are safety signals; if they flash, the cars behind you might not see you clearly, increasing the risk of rear-end collisions, especially at night. Regular maintenance of the electrical system can prevent many of these issues.
