Thank you for all the comments and suggestions. I am still testing it on the bench with my vacuum pump, not installed in the truck yet. I always like to test fit things before final installation. The wiper motor will be a bear to remove from under the dash when this truck is done.
Denny, I did run it for a couple hours this afternoon and no change that I could notice.
Jeff, that is a good idea. I was moving the slider all the way home for the test. I will try slightly off home position and see if it helps.
Mark
