If neither the right nor left blinkers work, then it's probably either the TS (turn signal) fuse, or the flasher.
It's not the one in the fuse box. There are 2 flashers, and the fuse box one is for the hazards. It's under the dash somewhere. Details vary. Usually it's near the steering column, between the column and the radio.
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Numquam ponenda est pluralitas sine necessitate.
— William of Ockham, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi
Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:
The simplest explanation that fits all the facts is probably the right one. | 
