Started raining, fired up the wipers. They worked for a while & then suddenly slowed down & then stopped! Drove in the rain squinting thru windshield. Not Fun!!! Parked car. Got back in hour later, still raining, fired up wipers, worked but very slow. 15 seconds later, wipers stopped & won't work. Doesn't sound like fuse as they are intermittent. Wiper motor maybe? Any other ideas?