I had this happen to my 1998 Grand Marquis. The turn signals and flashers went thru the same switch on the steering column. I took a can of electrical spray cleaner and sprayed the switch. Then I pushed the switch on and off real fast and then pounded on the steering column near the switch. I did this several times until the corrosion came off the switch. They have both worked ever since.
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I had this happen to my 1998 Grand Marquis. The turn signals and flashers went thru the same switch on the steering column. I took a can of electrical spray cleaner and sprayed the switch. Then I pushed the switch on and off real fast and then pounded on the steering column near the switch. I did this several times until the corrosion came off the switch. They have both worked ever since.