your going to warn part number EL12. before you go and buy one, you can just pop the hazard flasher out, which is in the fuse panel, and put it in place of the turn signal flasher. which should be under the steering colmn on the early car, or behind the glove box on the later cars.
right now, do you even have the clicking of the flasher?
i can explain the circuit to you if you want, and tell you whcih wires should have voltage where. i just had to do this on my car a few weeks ago, turns out the power wire that goes into the multifunction switch was bad.