Sorry for the delay in replying. My Verizon e-mail service is down for maintenance going on two days now. I am not receiving automated messages that you posted another comment. Hopefully that will be fixed soon.
This is a weird one. The only thing that controls where the wipers park is the park switch inside the wiper motor. It is a brass ring on a 2" diameter gear, and a contact attached to the gear cover. Years ago it was fairly common for the contact to overheat and melt into the plastic gear as soon as the motor was turned off. The next time the motor was turned on, the rotating gear would tug on that contact and bend it up so it shorted against the metal cover. That would cause the fuse to blow. This is just a guess, but maybe they added an insulator to prevent the contact from shorting so the motor would still function. It's a safety issue. The first failure might occur just at the instant you really need wipers.
Some covers are riveted to the motor's case, some are bolted on. If you care to remove the cover, I suspect that's where you'll find the problem, but I don't know if you'll be able to fix it. A replacement motor, I believe, is in order.
Sunday, March 28th, 2010 AT 8:24 PM