Yes, unbolt the box and you'll see how it comes apart. I believe you snap it out of the fuse box, and then there's a 10mm bolt that holds the lug to the terminal.

I have to disagree on the wire size. You can ALWAYS go thicker, just not thinner. Thinner wire cant carry as much load, and will fry stuff if you try to push too much amperage. A larger wire will carry more load, and you can never have too thick of a wire. As long as you can fit it in the terminal on the fuse box.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride