Over a period of about two weeks the front wipers started to fail. First the self park stopped, then the intermittent wipe stopped and finally last Sunday they stopped altogether. The 15amp fuse had blown and a replacement blew when the washer press switch was operated. Another one blew when the wiper switch was moved to the Normal wipe mode. There has to be a short somewhere, but where? I have removed the wiper switch unit and it appears to be OK. Where do I go next please?