I pulled my wiper box only to find out the motor was entirely frozen with rust.

Can I replace just the motor? Can the existing one be fixed?

I am also looking for diagrams, is there a source for diagrams online? Specifically I need the front knuckle/brake/suspension diagram.

 

Mine was the same way. I pulled it apart and cleaned it, replaced the brushes and replaced the housing with one from an 87 XJ6. It works beautifully now. When I put it back together I sealed all the seams with silicone and cut the end off a 16 oz soda bottle and wrapped that around it with zip ties to keep it from sitting in any puddles.