Hi,
Chances are you have a bulb that has failed. When you turn the signal on and it flashes fast, step outside the vehicle and see if either the front or rear isn't flashing.
I believe these use a dual element bulb. That would explain why they work for parking lights and not a signal bulb. See if the brake lights work on both sides as well. The same bulb for the brakes works as the flasher.
Let me know.
Joe
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Wednesday, November 2nd, 2022 AT 2:45 PM