understanding the 1970 wiper relays

[Lz7w]

I just noticed that the wipers in my 1970 don’t “park” correctly, and I’m having some trouble understanding how the 2 silver relays are supposed to work.

from the wiring diagram in this post (http://forums.pelicanparts.com/porsche-911-technical-forum/194934-70-wiper-motor-question.html), it looks like the “follow up” relay has one primary signal from the stalk to indicate whether the wipers should be parked (i.e. when T is powered I think), but I’m having some trouble really understanding the details of the diagram and how the 2 relays, motor, and stalk all interact to properly park the wipers 1. between intermittent cycles or 2. when the stalk is moved to the off position.

could someone more familiar with these diagrams help explain how the follow-up relay works? many thanks!

[rswannabe]

The park function is really carried out by the park ring in the wiper motor itself. This is a C-shaped contact that passes power to the motor when the switch is in the off position but the wipers are in the non-parked position. When the wipers get to the park position, that is the open part of the C shape, so the wiper motor stops.

Check that you have power to lead 53a on the motor when the power is on. If you do, then the issue is likely the contact in the motor.

[Lz7w]

Check that you have power to lead 53a on the motor when the power is on

so just to clarify, ‘the test’ to run is to see if 53a has power immediately after moving the stalk from one of the ‘on positions’ back to off since the follow-up relay should be providing power to 53a to return the wipers back to the parked position?

thanks again for the help!

[rswannabe]

It is my my understanding that 53a should have power whenever the ignition is on.