What Causes the Car Lights to Flash On and Off?
3 Answers
If it's the hazard lights, it may be caused by the hazard lights being turned on. If it's other lights, it may be due to poor contact, and you can go to a nearby repair shop to check the specific reason. Here is some information about hazard lights: 1. Hazard lights are the car's emergency warning lights, which are used to alert other vehicles and pedestrians that the vehicle is in an emergency situation and needs to give way promptly. In other words, if the driver needs other vehicles to slow down or even stop to give way while driving, the hazard lights should be turned on in this case. 2. Hazard lights should only be turned on when necessary and should not be used otherwise.
I've been driving a taxi for over ten years, and most of the time when the car lights flicker, it's due to wiring issues. Especially in older cars, poor contact from bumps can cause constant flickering. It could be oxidation at the bulb socket causing poor contact, or the spring clip on the fuse base becoming loose. The most dangerous scenario is when the wiring insulation is damaged, causing a short circuit to the chassis—not only will the lights flicker, but the wires can also overheat. Once, while carrying passengers, my headlights suddenly started flickering rapidly. After pulling over to check, I found that the wiring harness in the engine bay had been chewed by rats, exposing the wires. In such cases, don't force the car to keep running—it can easily fry the ECU. You need to cut the power immediately and call for assistance. For cars with retrofitted HID lights, also pay attention to whether the ballast is about to fail.
When modifying cars, there are quite a few reasons that can cause headlight flickering. Unstable power supply is the primary culprit—issues like corroded battery terminals or a faulty alternator regulator can cause voltage fluctuations, leading to LED light flickering. Poor soldering joints during wiring modifications can also cause this, especially when splicing wires for daytime running lights. Just last month, I helped a fellow car enthusiast troubleshoot an issue where his newly installed demon eyes were flashing erratically during the day—it turned out to be cracked solder joints on the relay module. To diagnose, use a multimeter to check voltage stability; if the voltage difference between idle and revving exceeds 0.5V, it indicates a power supply problem.
