washer pump comes on with wipers every time

[rgunlock]

Working through the little bugs after a 6 year restore of my 78 GMC. One of them is that the washer pump wasn't working but the wipers were. I'd bought a new pump/motor about 6 years ago when I was just thinking to get everything working on the truck - before everything snowballed into a full restore. Not sure the washers worked then, can't even remember if they were plumbed.

Today I just put another new washer/wiper pump/motor on. Good news is that the pump works, but comes on with the wipers without pushing in the switch button. They squirt in low, high, and with the button pushed. I've replaced the switch during the restore, and all the wiring is new - part of an AAW harness I installed.

I could use some help troubleshooting whatever I screwed up. Any ideas? Looking for some "where to start" suggestions before I go pulling my dash apart (again) to start going over the wiring, test the switch, etc.

--thanks, Rick