2019 Polaris sportsman 850 fuse block

[Cewardjets]

How do you add a wire to a spare fuse in the block?

[Mech]

You're talking about using an empty location in the fuse box I presume ? Haven't seen a fusebox off one of those things, but generally you get two new terminals of the right sort, connect wires to them, then insert the terminals into the fuse box till they click into place. Most terminals push in from the back where the wires are.

If you want to pull an existing terminal out to connect an extra wire to it(or to see what sort of terminals they use), then you look in from the front and back and identify the clip they use to lock the terminals in. Some things have a metal tag that's part of the terminal, in which case you slide a pin in to force/bend the tag flat, pull the terminal and then rebend the tag so it will lock again, or they have a plastic tag that's part of the box, in which case you either slide a pin in between the plastic and the terminal to bend the plastic tag aside while you pull the terminal, or you have to use the point of the pin to stick into the plastic tag and lever it aside while you pull the terminal. Unbolt the box so you can flip it over and look down beside the terminals front and back and you should be able to see what sort it has.