adding electric fan

[85Ram50]

That wire (black red stripe) had power with the key on not cranking when Geezer guided me through figuring out how to power my fuel pump before I got the kit it is running off now. I'm pretty sure something is shorting too.
Something in the wires is still off since the toggle switch doesn't work. Or maybe the new toggle switch is bad out of box and grounding it? I'll put the old (new also, I changed it just in case) one on just to see, if the fan still runs when I try again. I have two big things to learn this winter, what program to get to design a small building and how to wire my truck from scratch. .