get a multimeater from autozone and test the leads where it pluggs in while the turn signal is operational. if you are getting power to the fuse. if the fuse is good, test the hazard light switch. if that is good, test the flasher. if you are getting power to the flasher, test the switch. if there is power at the switch, test the socket. when you find the place that has lost power, your problem lies behind the last place that had power.
example: no power to socket, switch, or flasher, but the fuse is working, and you have power to the front side of the hazard switch, but not the back, the hazard switch is broken.
if you need a wiring schematic, let me know.