Wiper motor runs but won't park., Can't anything be easy? Options

[Olympic 914]

Ok I got the wiper mechanism cleaned up and lubed and was ready to install.. So I thought....

I wanted to be sure it ran and was in the park position before I replaced it. looked up the procedure in my Haynes manual, ( Clymer manual has same procedure)

Connect a 12V Neg line to ground.
Connect a 12V Pos line to both terminals 53 and 53a.
When motor starts to run disconnect term 53 and allow motor to park.

Doesn't happen.

As soon as I disconnect 53 motor stops wherever it is.

power to 53 runs low speed.
power to 53b runs high speed.
power to 53a alone does nothing.








Although not in the instructions power to remaining terminal 31b also does nothing.

Checked to be sure all the contacts were touching and they appear to be. Gave them a little brush with a points file to be sure.



all three are making contact, you can see the tracks in the grease.




No sense in putting this thing back in until I get it sorted out.

BTW if it makes a difference, car is an early 73. No intermittent wipers. all testing done on bench.

Edit:

Adding another picture, this was taken before I disassembled everything. two red/black wires go to pin 53a. ( on Prosperos wiring diagram it shows 2 red wires - no black trace)

[Olympic 914]

Thanks for that info but it must be a diagram for a different year.

on this motor, 31b terminal goes to the middle contact,
53a goes to outer ring contact
and inner ring contact is grounded to the cover.

I can't quite wrap my head around how this thing is supposed to work. I am looking at the Procperos (?) wiring diagram now but it still eludes me.