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Well, if all the bulbs, fuses, and switch check good, it is down to either the flasher unit, bad ground, or wiring. I would suggest finding a wiring diagram for your specific year online and start from there.
sounds like the turn signal flasher relay. You can google for vids to see where it is or reference the owners manual. Check out IPD, FCP Euro, eeuroparts etc for the part number and cost. Should be in the $10 range.