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Bad connection at battery, bad connection at starter, relay problem, defective starter, wiring issues. More symptoms would help eg: does it turn over but won't start? does it click the starter solenoid? When you turn the key do you get power to the relay? Also check the fuse box in the right rear corner behind the battery. They are known for the body work rotting out and the box coming loose causing electrical problems

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Q: Why when you installed a new battery car 1986 fiero will not start old battery tested no good?
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