Battery becoming very hot
@Eddie348 Lets see where the battery feed connects. Then do the same for alternator.
Battery Feed is what I'm calling the smaller wire attached to the Battery positive terminal.
In this photo, it looks like it attached to the stud on the starter relay.
Step 1. Can you confirm there is just one other wire attached to the stud?
Step 2. Follow this Heavy red wire and see what it attaches to next.
It looks like its this one with the arrow pointed to it.
If so, what does it attach to next?
If you find it attaches to a special wire marked fusible link, that's factory. That in turn should go into the big connector on the firewall.
But you may find something different. Let us know.