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That depends on the make, model, and year of car. If it is a Ford from 1980 - 1990 then it is most likely a bad earth connection to the body of the car. Other cars have other problems that can also cause this.

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Q: What causes a speedometer to go crazy and the car to die after replacing the alternator that kept draining a 7 month old battery that stays fully charged out of the car?
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