2006 Chev. Silverado HD2500 Wipers & Washers Stop Working Suddenly
I checked fuses and relays, and have also had a service shop do the same.

The problem originated right after I had a new plow installed. I had them review in case they disconnected something.

All other functions on the control stalk work fine.
I have found hints that the wipers and washers share a ground, but have not found any ground issues, although I am not certain I have found the right ground.

I did just see a replacement video for the Wiper Control Board. Any chance that has the common ground, or can cause both wipers and washer to fail at the same time?

I am the original owner and the truck is well maintained, so I know I use the wipers and washers all the time.