Turn signal doesn't always work and sometimes blinks really fast

Even after bulb change, do all lamps work? Bad ground can be shown by weak or dim bulb sometimes and this can cause fast flashing. All bulbs which flash must be working and of normal brightness which is sometimes hard to tell when they blink really fast.

Flashing too fast means that at least one exterior bulb isn't working. IF its an intermittent problem, once bulb could not be making connection at times. next time its flashing fast, stop the car and look to see which bulb isn't working. Replace that bulb, clean the socket at the same time

http://www.wikihow.com/Fix-Grand-Am-Turn-Signals You can try this , if you don't want to fool with it, spend $40-$50 and replace multi-funtion switch

Have you checked all the bulbs (rear as well as front)?

The fast dash turn signal indicator is telling you one of the lamps is faulty. Check all of them and you will most likely find your problem.

Your right rear turn signal bulb is blown.Replace the bulb and the fast blinking will stop.

Your rear turn signal flashes fast because the front is not working. Most likely you have a burnt out bulb in the front. If your A/C compressor can be turned over by hand and doesn't lock up or make any clanking sounds it's probably alright. The compressor will not run if the system is low on refrigerant. If you're having problems with the A/C and heater controls, that would be the first ting to repair. It doesn't sound at all like any electrical problems.

Normally with the blinker blinking really fast, it's telling you that one of the bulb is blown, front or rear signals. Check your fuse, and fuse relay to see if it would fix the promblem

Hi. One of your lightbulbs is going to burn and is shorting. When It happens get out of the car and you will see that the one doing that doesn’t blink.

any increase in bink speed is direcly related to a bulb being burt out.

try changing this relay