88 4Runner V6

There is a wire leading from the positive terminal of the battery to the fuse box. It has broken and needs to be replaced. How is it connected at the fuse box? Do I need to remove and disassemble the fuse box? Pop off some plastic? I didn't poke around too much for fear of breaking something else!

What gauge is that wire (maybe upgrade to a thicker wire at the same time?

Thanks in advance!


1988 4Runner, V6 Auto, Mostly Stock
32 x 9.5 Swampers