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My dad had a similar problem with his F-150. There is a secondary computer called a GEM modual that controls things like headlights, wipers, locks, vents, etc. If the GEM gets wet or is fryed for whatever reason it will cause your acessories to malfunction. I'm not sure if Thunderbirds have such a computer, but its worth a shot. They run about $150-$200 from Ford.
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