D,
The Symptoms you describe definitely sound like a failed wiper module.
Hi Jeff,
Unfortunately this part has been discontinued and I do not have a cross into a Workhorse part #. I did do some searching online and found a few places that still have that part in stock. Here is a link to one of those places: http://bullseyeindustrialsales.com/sure-power-1306gm-15740681-electric-module-77951
Dennis,
Unfortunately there usually is no "easy" way to replace this module. The only exception are the Winnebago and Itasca's with the flip up dash. If you can remove your instrument panel that may give you enough room to reach in and get it.
Leo,
The wiper control module is located on top of the steering column support behind the dash. If you were to get on your back and look up under the dash it's going to be bolted to the flat top piece of that support. If you need further diagnostic help with this issue we can send some diagnostic aids.
Monroe,
Do you have the last 8 digits of your VIN so that I can try to help out with the issue?