It is possible one of the left side light bulbs is burnt out. A burbt out bulb will cause a higher current to pass through the flasher component and the flasher will rapidly cycle on and off.
One of the bulbs is out. Replace it.
A signal that is blinking fast usually indicates a bad bulb or bad flasher. Check to insure all of the bulbs burn, then check the flasher.
Turn on that fast blinking signal light and check to see if the front and rear signal lights are both working, chances are you have a burned out bulb. If both front and rear bulbs are flashing fast, replace the flasher relay.
A bulb has burnt out that is why it is blinking fast. Check the front and rear bulbs.
my 1994 tercel can do like 130 k/ph on a long stretch of highway, but realistically over 110 with the suspension and wheels it gets shaky.
Its probably a bad flasher or sometimes a bad bulb can cause that to happen.
Usually, a fast blinking turn signal means one of the outside turn signals (front, back and side) lights is burned out.
I would look at the REAR signal light on the same side of the car. It is probably not blinking at all and the bulb needs to be replaced.
When blinker is blinking too fast it usually means one of your turn signal bulbs are burnt out. Check if bulbs are working. If not replace blown bulb.
The new bulb is already burned out, not seated properly in its socket, or you replaced the wrong one. Get out and look at the signal lights while they are blinking fast. Either the front or rear light is not blinking at all. That is the one that needs to be replaced.
A light bulb needs to be replaced. The signal is fast because the electrical current is there, but since it does not turn on the burned out bult, it makes the others work twice as fast.
If the right blinker is blinking really fast, it means that there is a turn signal bulb on the right side that is burned out. (coulod be either front or rear)