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Don't depend on "new". A new part can also fail and they can be faulty right out of the box.

Find a voltmeter and test the battery. It should be around 12 Volts, maybe a little above. Then start the engine (using a jumpstart if necessary).

With YOUR car only running on the battery, use the voltmeter again to test the voltage. If the alternator is working you should have about 13.5 Volts. If it's much below that the alternator isn't working. If that's the case, make sure it's connected properly before you try to replace it.

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Q: Car only starts when jumped with another car and my battery is new so is the alternator what else could it be?
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