power comes from the ignition switch and the power wire is hot to the wiper motor the whole time the key switch is in the "on" position. The 2 speed wiper switch is not made by anyone anymore. The 2 wires coming from the wiper motor to the switch get grounded, If I recall, one is low speed, then both grounded is high speed, but I could be wrong on that part, it has been a while. I ordered a newer switch (64 truck, I think) that works correctly, but requires a slightly larger hole in the dash. Let me see if I can find what I ordered. I know I ended up filing the hole out in the dash and then I had to drill out the bezel nut for the original switch and buy a1/2-28 jamb nut (ebay) to fit the new switch. I put the old bezel on as a washer, and then the nut, and then the knob. You can't really see the nut with the knob on there. Also, the newer switch has the washer connection and shaft that sticks through the center of the knob. You either need to cut it off, or drill the center of your knob out if it does not already have a hole in it. (or buy a new knob if you don't have one)
I think this is one like what I bought. https://www.americanclassic.com/1964-66-Wiper-Switch-Two-Speed-W_-Washer/productinfo/67%2D648/
