That means that your bulb is getting ready to blow so u might need to put another one in cause when it blows it still blinks in the inside of the car but not on the outside. In my experience, it means that one of your turn indicator bulbs has already blown. Try turning on the blinkers in the direction that blinks rapidly and get out (while the car is stopped, of course!) and look at the front and rear turn inidcator lights on that side. You will probably see that one is not blinking. If you check and the bulbs are good, you may have a short somewhere. Good luck. === If it is just a random clicking noise but the signals still actually works, check out this forum for fixing it up http://www.grandamgt.com/forum/showthread.php?t=50126&highlight=clicking+signal+light
One of the bulbs is burnt out and not working.
It has been my experience that a rapid turn signal indicates there is a burnt-out signal light bulb (either front or rear) on the side of the rapid blinking signal. If the right signal is blinking rapidly, the problem is in the signal lights for the right side (front or rear) of the vehicle. Turn the rapid signal on and step out of the vehicle to find which bulb is not lighting.
If it's blinking, it's a turn signal.
You have a broken spring in the steering column
Defective turn signal switch.
Check to see if the brake lamp and turn signal lamp are the same bulb. If so, its a bad bulb. See sources and related links below to lookup bulb information.
Check for a burned out bulb or could be the turn signal flasher going bad
it needs to be replaced
Defective flasher relay.
change the flasher to a slower blinking brand. They are cheap and you can try a few brands
One reason why the turn signal will not stop blinking is the clock spring. This is something that many people replace themselves. Another possible cause of this problem could be the switch needing to be replaced.
Turn signal lights that double as parking (marker lights) when not blinking.