If the lights blink fast on either side of the car then this means you either have non-factory bulbs in the car or you need to replace your blinkers because one of your lights is out.
That can happen when there is a bad ground to one of the lights.
you need to change the flasher can for the signal lights
On a 1999 GEO Tracker, a bad fuse can cause the headlights and dash lights to blink. A bad voltage regulator or alternator can also cause lights to blink and flicker.
turn signal relay is bad
Buy a "highway" turn signal flasher
If you mean the headlight switch, pulling it out once turns on the dash lights and turns off the daytime running lights, pulling it again turns on the headlights.
If the lights flicker when the vehicle is running, the alternator is on it's way out.
burnt fuse. check the fuse box
You either have a bulb burnt out or the turn signal flasher is bad.
Maybe a short somewhere...did you replace the flasher unit? No - it was blinking spuradically(?) - now I have to blink it manually and it won't blink at all with lights on.
bad headlight switch.
Check electrical grounds