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could be a poor ground if both are doing it could be dimmer switch if only one it could be the bulb itself

I had the same problem in my 1992 Cougar LS. I simply replaced the headlamp switch. It cost me $12 and took me about an hour to do it. The switch is to the left of the steering wheel. You will need to take the dash apart, and replace the switch. It was the first repair I ever did to any car, and it was so simple and cheap, I'm going to keep fixing things myself. ! -Cricket

ANYTIME YOUR LIGHTS BLINK ON AND OFF THERE IS A 90% CHANCE IT IS THE LIGHT SWITCH ASSEMBLY

I am currently having the same prblem...the lights work perfectly for a little while, and then they start blinking constantly. It seems like when the lamps heat up, they seem to shut on and off...I'm doing a complete troubleshooting expedition tommorrow...

hey guys... the headlight problem is a FACTORY RECALL for the 91-94 cougars.. take it to the Ford Garage and have them replace it for FREE..

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โˆ™ 2015-07-17 17:39:00
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Q: Why would lights on a 1991 Mercury Cougar blink off and on while driving?
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