Brand new alternator, battery light stays on

Hello,

This could be a wiring issue or a blown fuse.
Check the fuse number 7 in the fuse box that is located on the left side of the dash.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuse is good, then it is likely a wiring issue.
I have attached the troubleshooting guide and the wiring schematics below.

Please let me know of any questions.
Thank you.