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Need more info. Do they light up, but just dont flash or do they not light up at all? My wifes Z just had a wierd problem where the left side would flash, but the right side would just light up but not flash, and with the hazards on they would all flash. It ended up being the flasher. $4. I though if the flasher went out, it would'nt work at all, I was wrong. Id spend the 4$ for a flasher before I buy the new switch.
You said you checked the obvious, but did you check the flasher unit that is held to a clip under the passenger side of the dash (at least that is where it is on my 72)? This is the 1 1/2" diameter flasher unit (mine is blue plastic) that is about the same height. I think it controls all of the turn signal and emerg. flashers.
Gary
Does power go to the lights? If fuse is okay its probably the flasher under the pass. side dash. I had the same thing a few months ago & that was the culprit. Cost - $2.00