The three most likely causes seem to be the following:
Here are some suggestions from our community on how to resolve the problem:
Check out the "Related Question" below for lots of information about malfunctioning flashers on Taurus - Sables. It's not as bad as you might think...
It has 2 different flashers. One for the turn signals and one for the emergency flashers.
The emergency flashers are "ON". The two wires that feed the lights are shorted together. Check the front turn signals also for both being "ON"
because of the flashers relay in dash board.
hazards and turn signals have separate flashers. replace flasher for turn signals
You may want to check the thermal flasher.
Bad switch in steering column? diffrent fuses.
turn signals and emerg flashers work off a flasher can. go to any auto store and buy a new one they are cheap and easy to replace
We need more information. Never work? Come on and not blink? Do the 4way flashers work?
The bulb is bad. Turn signals and flashers use different bulbs.
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.
Usually that would be the case, however their are variations in both cars.