Got my wife's car back from the tranny shop(aod) 93gt. No turn signals,front or back. 4-way, flashers and running lt's ok. Was something dicconnected at shop? Signal lt's were working fine before.
Check the flasher relay, it should be just below your glove box. Make sure it's pluged in and getting 12volts. Check all of your fuses. Try replacing the flasher relay if the rest is good (they are about $2 at wal-mart) Let us know what happens. If it's not that, might be your multi function switch, which is a lot more costly than the previously mentioned parts.