A very good and needed write up on testing the wiper motors (Thank you)
I have some additional information included on my build thread that might be of interest to you or others in troubleshooting their possible problems or wiring the system for a 67 – 72 Chevy truck (post #527)
http://67-72chevytrucks.com/vboard/s...318544&page=22
I did barrowed the wiring drawing picture in your post to help clarify/understand my post better, hope you don’t mind and also created a link to your post in mine.
Bruce