Hey Dog. So, I see a couple of issues here.
First is that this is a 2015. it doesn't have a fusible link. There's none mentioned in the text of the manual, none on the electrical drawings, and none designated on the wiring diagram. Whatever video you saw must have been for a later model.
Second, your pictures, especially your first picture, shows a big, fat, black wire going to the positive battery post, along with the other red wire and the smaller accessory wires. BRP is very good at following color conventions. They would never put a black wire on a positive post. That wire enters the battery compartment through that oval opening in the left rear wall. So, truthfully, it looks like the black ground wire that is supposed to wrap behind the battery, onto the negative battery post. Second pic. If it is, it would have been a pretty shocking experience to hook that up to the positive post. However, the battery appears to be some kind of lithium unit, and the battery management system would have shut it down. So, in other words, it looks like you have the ground cable connected to the positive post, instead of the negative post.
Attached are two pictures to try to help. There should only be one main red wire going to the positive terminal, along with your smaller accessory wires.
That fat black cable doesn't belong. I don't know what your capabilities are, but at this point, you'd be better served by hands on, in person troubleshooting. Along with the wiring issue, You'll want to check fuse F3 in the Left Side fuse box.
That's LEFT hand side as though you are sitting on the bike. If that's blown, it will take your alternator off line. But resolve these wiring issues first. Good Luck.

