Hi,
It sounds like the battery is weak and the alternator (although it's new) isn't producing. That can be caused by one of two fuses. If you take a look at pic 1, I highlighted two fuses. One is a simple fuse and the other is a fusible link and located at the positive battery terminal. I need you to check both.
In addition to simply checking the fuse, make sure power is to it and from it. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If you look at pic 2 and 3, it shows the locations of the fuses.
Let me know what you find or if you have other questions.
Joe
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Sunday, December 20th, 2020 AT 10:36 PM