Had this problem with my old MK5 run about. Constantly blowing the fuse, got to the point where it would blow when just turning ignition on changed un told fuses, wiper motor, arm etc etc still did it. AA were called in the end, looked at it for 5 mins and said....hmm could be motor or wiring, but that looks ok

Sold the car in the end It was well overdue anyway....

I'd look at the wiring if none of the above help....