This happened to me too. It ended up being a short in the Flasher Relay. You will have to get it from the Dealer of from the Junk Yard. And it is located next to the steering column on the right. It is not visible because it is hiding above a black plastic something or other. Remove the Plastic cover, 3 screws. Then turn on the blinkers. Then feel around for the Blinker Relay, you will be able to feel the vibration. I do believe I had to undo the brake switch at the brake pedal.. But anyways, it looks like a black box and the Left and Right relays are encased in it. You do not need to open the black box. You will be replacing the whole part...
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