well i know with a 3i loom (mfi) so similar i believe, the fuse holder, does indeed hold the fuse for the wipers (two wires going to this). I also have a thick seperate purple and black wire with a metal 'clip' on the end but this doesnt go anywhere as far as i can see, had my dash out a few times and still have never found out where it went,lol.
hope that helps and good luck with the car