Ford Mustang Repair Question
If the wipers work when you go to clean the windsheild, you know that the motor is still good. That narrows it down to an electrical problem. Check your fuses under the dash and under the hood. Also, I wouldn't think a bad fuse would make one turn signal act up. Usuall when it blinks really fast, it means one of the filaments in the bulb is out and you need to replace the bulb.
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One of the bulbs is out.
The wiper problem is probably in the switch itself.
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