All about turn-signal issues and how to fix them
While they may be largely dependable and go for many miles without any issues, cars inevitably run into some problems. These can be mildly annoying or actually life-threatening if left unchecked, but in the case of a car turn signal blinking fast, you don't have to dive out and roll for cover. Here is a quick rundown of what it means if the light for your car turn signal is blinking fast and how to fix it.
If one of your indicators is blinking faster than it should, this is often because the corresponding flasher at the front or back is not working. This could be the result of a blown bulb, low power flow or an ungrounded wire, or even a blown fuse. Alternatively, there could be a problem with your flasher relay.
While it isn't illegal to do this in the US, as the roads authority allows for up to 120 flashes per minute, there could still be a legal issue. Fast flashing signals are usually the result of a blown bulb on the opposite end of the car, or one that isn't working for another reason. This will cause problems for you and other drivers if they cannot tell when you are planning to make a turn. Road rules also indicate that all lights need to be in good working condition.
This is known as hyper-flashing and is of ten caused by installing LED bulbs on cars that weren't originally designed for them. Fixing the problem of a fast blinking LED turn signal is as easy as getting the correct flasher relay for the new bulbs.