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Well it does jump start, but when we turn it off...it doesn't start up again after driving it around for 10 minutes allowing it to recharge. So i'm thinking its the alternator.
Not necasarily, if your battery is shot it will run on the alternator till you shut it down and then when you try to start it, it won't start.

Only way to be sure is with a volt meter.

You can also do a voltage drop test on the wires and a load test on the battery with a VM to be sure.

Guessing is what cost you money.

If you need help let me know.
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