If the emergency flasher works, the turn signal lever switch or the wiring to it is most likely the problem. If one lamp does not work even when a new bulb is installed, but other lamps do, check the wires for cuts or breaks, and check the connection of the ground wire to the body - corrosion of the ground terminal or the body steel around the connection screw can be an age-related problem.
If neither the turn signals nor the emergency flasher blinks the signal lamps, see if the brake lights work. If they do, check the wiring to the flasher unit, particularly if someone has worked under the dash to change the radio or do other maintenance, or if something on the floor was pushed up under the dash. Remove the flasher and check for voltage on the flasher socket with the emergency flasher turned on.
SOURCE: 96 ford tarus turn signal
The turn signals and the emergency flasher are controled by a single electronic flasher unit. It looks like an electronic relay and is located on the far left underside of the dash. It is on a mounting bracket and has a three wire connector. If you do not hear this clicking when you use the turn signals or the emergency flasher it may be bad. Just remove the connector and remove the one screw holding the flasher to the bracket. Be sure the replacement is identical to the old one and compare them before installing the new one.
You may want to also check the turn signal bulbs also. Other causes would be bad signal and flasher switches, bad bulb connectors, and opens or shorts in the wiring.
SOURCE: 1998 Ford Ranger XLT turn signals, hazzard flasher not working
wire plugin on back of turnsignal switch not making a connecting
SOURCE: 98 Jeep Wrangler turn signals and flashers don't work
The tail lights on the 98 use the screws that hold the light to the body of the jeep to ground the lights. Chances are the wholes that the screws/bolts goes into have a coating of rust around them and are stopping the lights from grounding. This may not be the solution but you need to eliminate this from your list.
SOURCE: Turns signals do not work on 1992 Ford Thunderbird
I Have A 92 Thunderbird To And Its Located Above The Fuse Panel You Will Probally Need To Remove The Panel Under The Steering Column To Get To It Its Located To The Right of The Steering Column It looks Like A Relay Not The Normal Looking Round Style Flasher
SOURCE: 1997 Chevy Tahoe both turn signals stopped working
Sounds like the flasher unit to me. Normally the emergency flasher and turn signal are separate.
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