There are no electrical connectors in this set up........
It works like the old VW system whereby pulling the stalk backwards, activates a small valve holding back the air pressurised water in the water bottle. The valve either breaks off, gets stuck, and if you are really lucky and it fails, it pisses water all inside the stalk and all over your legs and feet.............until the air pressure dissipates.
The stalk DOES NOT operate any electrical circuit, and this is what this switch is designed to do, operating an electrical contact for an electrical washer system, instead of the valve that was originally in the system.
http://1967beetle.com/windshield-washer-system/