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You have a blown bulb or bad wire to the bulb. Do both sides act the same or just one side? (Left and right turn) If only one side (Left) then only check that side.
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If the dash signal is blinking fast and the back of car signal is NOT working, then the problem is the bulb in the back of the car. The one that is not blinking needs to be replaced. The bulb that's not blinking is burned out, and this changes the resistance of the blinker circuit causing the blinker to flash rapidly on the dash indicator. FIX: Replace the burned out bulb in the back of the vehicle.
Note - Sometimes this situation causes the blinker module on the fuse panel to permanently change to a rapid or even a non-blinking state. In this case you must also replace the blinker device itself, which is on the fuse panel and looks like a small cylinder (or cube) less than one inch in diameter.
Usually a fast turn signal means that there is a light out. You should probably check all of your lights, including back-up lights, and turn signals. If there is one out then replacing the burnt out bulb should fix the problem.
The blinker usually blinks fast when a turn signal light is burnt or not contacting. Check the signal bulbs to see if they are contacting or in good condition. If that is not it. Try replacing the blinker under the dash.
The fast blinking means that the new bulb is not any good. Try putting in another bulb. If that does not take care of it, then it could be your blinker switch.
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