Based on your description, it sounds like the alternator isn't keeping up with the demand. I need you to check something for me. We need to confirm the alternator is performing at a rate that will keep things alive.
It's really simple to test. All you need is a voltmeter or a multimeter. Follow the directions in this link.
Let me know the results. I would like to start with this before we try finding a poor connection (which I don't feel is).
If the alternator fails the test above, I need you to check two more things. First, in the under-hood fuse box, there is a 10-amp ECM fuse. Confirm it is good and has power to and from it.
If that checks good, I need you to locate the white wire on the alternator. That wire which sends a charge to the battery has a fusible link. A fusible link is similar to a fuse but can look like a wire. So, what you will need to do is disconnect the negative battery terminal. Then, check the white wire for continuity to the positive battery terminal. If there is no continuity, it is likely the link has failed.
Here is a link that explains how to test wiring.
Take care and I'll watch for your reply.
Note: I attached the wiring schematic below of the circuit. I had to cut it in half to make it readable for you. I thought this may be helpful for you. Also, the last pic shows the fuse I'm referring to in the fuse box. It's fuse 26
Images (Click to enlarge)
Thursday, February 24th, 2022 AT 7:50 PM