The first thing I would do is remove the alternater and take it to an auto parts store and have them check it. If the alternater is working good, then check the belts are routed and have the right tension. Either of these can keep the battery from charging. It's very common that a rebuilt alternater isn't working properly. If all these things are correct, check the live wire to the alternater is live. If it isn't alive you have problems in the wiring and I would take it to a mechanic.
Just cause its a new alternator does mean it should work. I would check the charge when running cause it could just be a bad alternator.
SOURCE: alternator not charging battery
You may need to have it tested to see if it's working the connections on the battery may not let the charge through or the battery itself may not take a charge if it's no good
SOURCE: My battery dies i replaced a brand new alternator but still dosen't charge tomthe battery
The battery most likely has dead cells and not charging due to the alternator .The alternator is doing what it should, your battery just can't hold the charge the alternator is putting out. Go have the battery tested at a local auto zone or advance auto store. Free to check
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