I have the alpine 9827 head unit and it didnt come with the fuse assembly. A friend of mine has the same head unit and it had a fuse on the yellow wire. I was wondering what that fuse does and do I need to go find one off ebay and wire it up? I wired the head unit without the fuse and it seems to work fine without it. I need all the help I can get and sorry if it was a stupid question cuz i know lil about this kind of stuff. thank you.