What to Do If the Turn Signal Flashes Too Fast?
2 Answers
Possible causes include a damaged flasher relay or poor bulb contact. Below are the reasons and solutions for excessively fast turn signal flashing: 1. First, check whether the flasher relay is functioning properly. Use a multimeter to test the output wire of the flasher relay to see if there is a 12V output. If there is an intermittent output change, it indicates normal operation. If there is no output or a constant 12V output, it means the flasher relay is damaged and needs to be replaced with a new one. 2. If the turn signal was previously replaced, it is likely that the bulb's wattage does not match the vehicle's original flasher relay, leading to abnormal behavior. If the wattage is too high, it can cause the signal to flash too quickly, or even result in slower flashing or complete failure to light up. In this case, replace the bulb with one that meets the specifications, and normal operation should resume.
Last time my car's turn signal was flashing unusually fast. At first, I thought it was a major issue, but later found out it was caused by a burnt-out rear bulb leading to unstable current. This is actually quite common—usually due to a failed bulb, as the control unit detects resistance changes and increases the flash frequency. I checked it myself: first activated the turn signal, then stepped out to see which side's light wasn't working. If it's a bulb issue, just buy a new one (costs around 10+ yuan) and replace it. If it still flashes fast after replacement, the flasher relay might be aging and needs replacement from an auto parts store. This also happens often when retrofitting LED bulbs without adding resistors—a resistor module can fix it. Fast-flashing isn't trivial: faulty turn signals mean others can't see your intention to turn, posing serious risks. Get it fixed ASAP. Regular maintenance includes bulb checks—prevention is key.
