its not your flasher, check the grounds, also, maybe try plugging in the right side housings (one at a time) to the opposite side of the car that does work, this might show you that theres something wrong with one of them,.,...if they both work, it's your wiring that is going bad on one or both of the units on your right side.
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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