I need ideas. I've replaced the rear wiper motor on my Wife's 1999 Explorer Limited three times in the last year. They never seem to work for more than 2-3 months. I have no idea why they stop working. Is there something I'm overlooking in the installation? They seem to go in very easy. No pushing, binding etc. I've been using remanufactured ones. Should I just bite the bullet and get a new Ford part?