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Battery is dead or the alternator is bad. Have your battery tested at an auto parts store such as pep boys. Chances are your battery will test bad - unable to hold charge.

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18y ago
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Q: Why would a 1986 Mustang 5.0 start and run for a while but when you turn it off and try to start it it sounds like the battery is dead and won't start but when you jump it it starts right up?
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