85 chevy windsheild sprayer not working (electrical)

[Backyard]

Heres the deal. I am building my square trying to button things up for mechanical inspection.

my sprayer is not working. I got my wipers to park and high and low speed works. I tested the switch in the the in the column using a meter (continuity when pressed). I uses a test light to test the wiring at the pump. I have no ground nor do I have power at the pump when pressing the wiper switch.

I have gone over the wiring diagrams and I can't seem to get it to work. Any one have simular issues?

 

[Scott91370]

Mine is exactly as you describe.
I was able to check the power at the sprayer and I have 12V+ there so this tells me that it has constant power and the sprayer button completes the circut as a ground. My onbly problem is, I haven't wanted to tear into the switch and follow wiring to find where the ground is broken.
Another thought is, maybe it isn't supposed to be constant 12V and something else is wrong.

 

[bedwards]

I had the same problem and symptoms and it was a single fried diode in the wiper module under the steering column. Do a search, there is a thread on this forum on what to look for.
https://www.gmsquarebody.com/threads/wiper-pulse-module-15598496.28952/