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If the battery's dead it could be the alternator or a bad battery. If not, the starter. Try jumping it. If it starts the starter's OK. Then investigate the alternator and battery.

Does it turn over but not start..?? There is a difference. Doesn't turn over would most likely be the battery, which is typically followed by a clicking noise. That would be the starter solenoid trying to engage but the battery doesn't have enough power to do so.

If jumping it starts it right up, let it run for 10 or 15 minutes then (while running) check the voltage at the battery terminals. If it's above 14 volts, the alternator is doing it's job and the battery is dead. If the voltage is less than 14, then the alternator needs to be replaced.

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Q: If the engine doesn't turn over on a 91 olds cutlass calais how do you know if it is a starter of alternator problem?
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