Wiper Motor Parking

[NigelStn]

1969 280SL RHD
My wipers stop where they end up when they are switched off. I've tried this with the wipers disconnected from the motor and it stops in random places
I've cleaned the contacts, since the photo.
Could the issue be the motor wiring? The last photo shows that the connector box has been opened by a previous owner, which makes me suspicious.
I'm a new member and this is my first question, so sorry if I've missed something!
I've searched the technical manual and can't find the answer.

[BobH]

Hello, as well as the tech manual, just use the general search function above, most questions have been asked and answered before.  I found this post with the same problem

https://www.sl113.org/forums/index.php?topic=20233.msg143440#msg143440

The advice is always to take care when working under the dash and isolate the supply before putting your hands anywhere near the wiper mechanism

Good luck

Bob

[NigelStn]

Thank you Bob
I had seen this post, which is slightly different to my issue.  My motor stops turning as soon as the wipers are switched off, which makes me think that the motor is wired incorrectly.

[BobH]

Have a look on here for details of the wiring to the wiper motor plug.  Seems pin 4 should have a permanent +ve supply from the fuse, i think this is for the wiper blade parking, but have a read.  Be careful as this post discusses pagoda's and other cars

https://www.sl113.org/forums/index.php?topic=28526.msg206055#msg206055

[J. Huber]

I thought mine was the only Pagoda with the "intermittent wiper" option. I have never tracked down why (because it rarely happens) but my wipers sometimes jump up a bit. And parking them in their proper resting spot requires perfect timing when hitting the stalk mechanism.

Keep us posted on the remedy.

JH

[NigelStn]

Thank you
I think that I have a W111 wiper motor!

[mnahon]

That's correct, you have the wrong wiper motor. That's a W111 (5-pin) motor. The Pagoda wiper motor has 4 pins. It looks very similar but functions differently. While the W111 motor bolts into and plugs into a Pagoda, it will not park properly.

[BobH]

I thought mine was the only Pagoda with the "intermittent wiper" option. I have never tracked down why (because it rarely happens) but my wipers sometimes jump up a bit. And parking them in their proper resting spot requires perfect timing when hitting the stalk mechanism.

Keep us posted on the remedy.

JH

Hello James, assuming you have the correct motor, have you checked for the permanent +24ve supply to pin 4?  perhaps a bad contact in the plug or poor solder joint

[rwmastel]

I think that I have a W111 wiper motor!

That's correct, you have the wrong wiper motor. That's a W111 (5-pin) motor. The Pagoda wiper motor has 4 pins. It looks very similar but functions differently. While the W111 motor bolts into and plugs into a Pagoda, it will not park properly.

Hello James, assuming you have the correct motor, have you checked for the permanent +24ve supply to pin 4?  perhaps a bad contact in the plug or poor solder joint

Bad assumption this time, Bob.  :-)

I actually see six pins.  Is one just for making sure the plugs are oriented properly when connecting?

[BobH]

Hello James, assuming you have the correct motor, have you checked for the permanent +24ve supply to pin 4?  perhaps a bad contact in the plug or poor solder joint

Hello Rodd, my reply was directed to James who has a similar problem, we don't know what motor he has installed, hence the suggestion

[BobH]

I actually see six pins.  Is one just for making sure the plugs are oriented properly when connecting?

Yes, the small pin is just a locator

https://www.sl113.org/forums/index.php?action=dlattach;ts=1578840191;topic=28526.0;attach=243206

[J. Huber]

Thanks Bob. I am pretty confident mine is the correct one. I will check connectors.

James

[NigelStn]

Thank you everyone for your help, I've now sourced the correct wiper motor, though have to replace the connector.
I'm a little confused with the wiring as in the technical manual it shows:
PIN 1 = BLACK/GREEN
PIN 2 = BLACK/WHITE/PURPLE
PIN 3 = BROWN to GROUND
PIN 4 = BLACK VIOLET to VOLTAGE FUSE 2

The pin 3 on my motor does not appear to be earth (see photo)
Am I missing something?

[BobH]

Hello, i saw that in the tech manual, not sure why it's different from the wiring diagrams

The correct connections are:

Pin 1 - black/violet/white - to relay
Pin 2 - brown - earth
Pin 3 - black/violet/green - to wiper switch
Pin 4 - black/violet - to fuse 2

[NigelStn]

Thanks for a fast response Bob
That's what I suspected, but needed some reassurance!

[mBdrvr]

My W111 250 SE cabrio wipers park "arms folded" as can be seen in the picture even though they are not parked correctly. I believe the sedans do the same.

[cfm65@me.com]

Tks Paul,
My mistake, post removed. I had a Coupe as well as a Cabrio some time ago, which I both restored, can’t believe it got I wrong.
Apologies once again.
Chris

[mBdrvr]

No problem. I haven't investigated how to get the arms to park in the right places. They also don't park automatically after I removed and reinstalled the washer foot control. I need to figure that out.