Turn signal flasher relay is defective. Is located under the dash, driver's side.
one of the lights is not working
When both of the turn signals (indicators) of a car blink simultaneously, it is usually because the hazard lights are turned on.
Bad ground
check your ground wire in the back
1999 Audi a6 quattro, How I fix the problem when the turn signals don't blink, but hazard lights work well?
Check your alternator it could be malfunctioning. Sometimes it gives you warnings like this.
The emergency flashers and the signal lights are separate systems. Each has it's own fuse, switch and flasher relay. If your turn signals light up but don't blink I would blame the signal flasher relay.
An open ground or a short to ground when the signal is on. Usually a bad bulb.
The reason why is that the turn signal flasher is defective. There are 2 flasher relays on your vehicle. One for the turn signals and one for the hazard lights. The turn signal flasher relay is located on the driver side of the vehicle, passenger side of the steering column, under the dash, next to the cigarette lighter. It was also mounted on the driver side of the steering column under the dash on some 1995 Chevy Blazers. Be sure and look in both locations.
Answer Usually when the flasher blinks rapidly it's about finished. Try replacing the signal light flasher and see what happens. If you still don't have Brake Lights start looking for a short.
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.
When your 4X4 dash lights blink that is indicating a malfunction - could be just a sensor