problems with wiper wireing

I have loocked at the availible wireing schematics and nothing seems to match my van
I have a 65 chevyvan. a two position wiper switch which has a push button in the midle.

I an guessing I have a two speed motor, I have never turned it on and some of the wires were not conected when I looked at it.

The motor has the yellow wire going to it from the fuse. The wiper switch has a two wire plug with one wire going to the motor and a dark blue wire going nowhere also a single black wire plug going back to the motor.three terminals total.
Is this a two speed switch?
What is the push button feature on the switch suposed to do?

there is also an electric washer pump not conected to anything. Does the factory wiper switch with three terninals also control the washer pump or is there a seperate switch for that?

M1D

So has anybody ever come across one of the single speed with washer SW?? All the ones I have seen are ether 1 speed(1 wire) or 2 speed W washers (3 wire SW) I just put a 2 speed Sw(W/washers) & 2nd gen motor in my 65 from CA, it had a single speed harness & no washers on van. I used a 3 wire SW, used 2 wires,on the 2 outside pins on SW. The middel pin on SW is for washers.

Thanks guys
I have the two speed with washer switch for sure.
I have an aftermarket pump
My motor has no pump on it and I think it has four horizontal terminals
I'm going to take some pictures

It has a good fluid bag but I want to get something easier to deal with, any sugestions?

M1D