'71 K20 Windshield Washer Problem

[flyingtim01]

Hi Guys,

Got an issue that I was battling a year ago and just gave up on it. The wiper motor works, but when the wipers are running, so is the washer pump, regardless of whether I've pushed in the switch or not. I figured the switch was no good, so I ordered a new one from LMC, and it does the same thing. I finally just disconnected the hose from the reservoir. I don't drive the truck much anyway, so I can use the wipers sparingly.

I'd like to try and get it ironed out. I have the stock motor and pump setup, not an aftermarket washer pump. Any help you guys can provide would be great. I imagine this is a ground issue, I know that the motor has 12V all the time and relies on grounding for the different speeds, but I'm not quite sure how the washer pump works.