Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Wiper motor runs but won't park., Can't anything be easy?
Olympic 914
post Feb 16 2017, 12:01 PM
Post #1



***

Group: Members
Posts: 1,662
Joined: 7-July 11
From: Pittsburgh PA
Member No.: 13,287
Region Association: North East States



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.

Attached Image


Attached Image

Attached Image

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.

Attached Image

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

Attached Image


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)

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
Olympic 914
post Feb 17 2017, 08:28 AM
Post #2



***

Group: Members
Posts: 1,662
Joined: 7-July 11
From: Pittsburgh PA
Member No.: 13,287
Region Association: North East States



I found a wiring diagram that seems to make sense for this application, although its supposed to be for a 72+ beetle.

If you substitute the wiring numbers 31b for the 53e shown in this diagram, and disregard the "T" position on the switch, using only the 1+ 2 positions this seems the way it would work.


Attached Image

As I read this diagram the switch initiates the PARK function.

In the diagram above power comes in through 53a and flows to the contact point 53a and also flows back to the switch out through 53 (when switch is in #1 position) and to the motor and the motor runs at low speed. 53a is hot through about 290 deg of rotation of the contact plate (shown in red) to 31b through the contact point but 31b (contact track shown in blue) is now open at the switch.

When you turn the wiper switch off, now 53 is connected in the switch to 31b which continues to get power through the contact plate as long as contact point at 53a is within the 290 degrees, when the contact plate rotates to the plastic non-conductive section, the power supplied through 31b is broken and the motor stops. at about the same time the inner contact point (which is connected to ground on the case - shown in green )grounds the motor through 31b the switch and pin 53. that puts the wipers in the park position.

Attached Image

I hope this explanation works for you, but now I finally understand that the instructions on how to place the motor in park will not work. at least not in my application..


Attached Image

I think in order to activate the park function on a bench test you would have to connect up a DPST switch to mimic the wiper stalk switch.

Whew...

I though about this all day yesterday and in order to get away from it and rest my mind I did my TAXES. then woke up in the middle of the night still thinking about it.

Think I'll have my breakfast now.. (IMG:style_emoticons/default/chowtime.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 6th May 2024 - 06:32 AM