It's not the multi function switch
 

i just changed out the multi function [MF] switch to remedy the non- functioning intermittent wiper setting.
Intermittent still does not work with the tested working, used MF.
All other functions are working the same as the original
WTF?
Is there something else in that circuit that could cause this?
Thanks.

replace the relay...

Where is it located?

remove the cluster and you'll see it bolted to the firewall. Let me find a pic.....

here is the relay

http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1982%40%401982&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6142%3AMBC%7C 1489%3AED%7C10000129%40%40240D&keyword=wiper&subcatid=P:242127@@Wiper+Relay&mode=PA

no pic, does not seem to available .
I will go look for mine
Thanks

sorry try this link

http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1982@@1982&makeid=63@@MERCEDES+BENZ@@X&modelid=6142%3AMBC%7C1489%3AED%7C 10000129@@240D&keyword=wiper@@wiper&catid=All@@All&subcatid=P%3A242127@@Wiper+Relay&applicationid=W0 133-1626987&mode=PA

You right!
 

Well it took me two tries without a pic to get the correct relay out of my 81 but I got it , put it in the 82 and it works!
Boy, I tell you, if I had known about the relay first I would have saved myself an hour of wrenching and the price of the used MF.
Oh well it gives me a chance to look at the cars innards occasionally and I love learning new stuff.
Thats the beauty of the forum.
Thanks.

no problem...

Hey fruitcake, do you still have your old non-working relay? Can I buy it from you?

I made this little circuit board that I retrofit into the old relays. It brings them back to life and adds a user adjustable intermittent time delay. I need some more old relays to retrofit.

Let me know...