The unit seems to be broken, it's just a nylon cord that forces the antenna up, then it pulls the ant. down once the signal is lost. The nylon cord came a loose from the tip of the antenna, which is not repairable. By a new one.
Remove the wiring harness from the bottom of your 1987 Chevy Corvette power antenna. Remove the power antenna retaining nuts. Reverse the process to install your new power antenna.
Bring the destroyed external antenna to the store where you purchased it. Or visit any repair shops near you which will be able to repair the external antenna.
You can find a diagram of a 1977 Corvette horn assembly at your local library. Look in the car repair section for a Corvette repair book.
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do it good
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Haynes repair manual.Chev corvette 68-82($20)
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There are manuals and even forums that can give you information on how to repair your Corvette depending on what your looking for. You can try visiting www.gregsonline.com to order a manual for your car.
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You go to a car repair shop