You'll need a fuse, it goes in the engine bay fuse box if I'm not mistaken. Just figure out what type of fuse it is (I can't remember), and go to our local napa/ auto zone/ advanced and they'll have it, I believe it was about $8.50 total.
2003 Focus LX Red (RIP)
2002 Focus SE Red (SOLD)
1995 Jetta GLX: VR6, Intake, Exhaust, Lowered, 5-speed, you get the idea.