Help! My 2008 Silverado windshield wipers won't shut off, even when the truck is turned off. I have to take the fuse out to get them to stop. It was very cold out when I tried to turn them on, and they wouldn't turn on, then out of nowhere they turned on full blast and never shut off. It says in the manual that if there is something lodged in there then they will continuosely stay on... But it's been weeks. Could the motor need replaced?