'
Is '85 first year for the separate pump @ the tank?
Unless wiper trans/pivots seizing, it's often the motor itself.
Here's an '87 trouble tree you can try...
http://www.chevyk5blazer.com/forums/show...th-Stalk-wipers
Good luck!
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete