Because the hazard/turn signal relay has failed. A defective/intermittent turn signal switch can also cause this symptom.
turn signals and 4 way flashers are on different systems and use different flashers You would want to look for the turn signal relay, try putting on your 4-way hazard flashers so you can here the clicking noise of the relay, they might be under your dash. In my car it was underneath the dash directly in line with the steering column, above the brake pedal.
I hope you are not driving this vehicle with so many faults? Obviously an electrical system problem. Start with the obvious thing, fuses, then check all the bulbs by removing them and looking at the filament wires and the base to see if they are broken or corroded. Finally check the flasher both regular signals plus the hazard flashers, and replace as needed.
I just checked my '97 Sable wagon for a related problem; (HAZARD LIGHTS DO NOT FLASH but my Turn Signals do). I checked the HAZARD FUSE (15 amp), it was fine; I got my hand under/behind the dash and wiggled all the wiring harnesses and harness sockets I could feel, then all of a sudden my flashers started working. Trying to isolate it I pinpointed the problem to the HAZARD SWITCH located above the steering column cover, (PUSH-ON, PUSH-OFF) and wiggled the switch and then they stopped again, and/or started to work again. It is probably a loose connector which will require a total dismantling to get to it. BTW: The Turn Signals and the Hazard Flashers work from the same RELAY, a Blue Ford Relay located under/behind the dash, to the left of the steering wheel. This RELAY is replaceable with a UNIVERSAL FLASHER RELAY from any auto parts. In your case, I would check the Turn Signal FUSE, it that is ok, then substitute the Turn Signal RELAY with another.
Check the connections behind the dash (Dimmer, clock, hazard, and cigarette lighter) but specifically the hazard lights. If this connection is not made well then it will affect the turn signal. I would also check to see if the running lights come on. If they don't then I do not this this solution will work.
for hazard fuses check all the bulbs in all the turn signals/running lights. Next check for flashers, they are usually located with the relays on the vehicle, and on fords are typically round cylindrical thing that is about the size of a quarter If you are having trouble finding them turn on your turn signals and listen around your relays for something clicking with the lights. http://grote.com/product.php?product_number=44310 one trick i have learned is that you can swap the flashers around if there are more than one, and if that makes your hazards work but one of your blinkers not work then you know you just need one of them. they are cheap and do go out relatively often. if nothing else works i would check wiring harnesses and the hazard switch. hope my long winded answer can help.
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