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windshield wiper not working in my 1995 s500?

 

[Merc-S600]

You should specify more information of what happens when you activate the switch ,are they just dead or is there a noise you can hear ,does water spray out of the nozzles if you try it ?,what happens when you tap the relay ? (if you done that wich i doubt ) ,check the fuse 1st then try tapping the relay,if they still wont come on then, after that it starts to get complicated .
Check the link within this one & lets hope it will get you wiping again the cheap way around ,also try doing a SEARCH on the forum ,the arrows on the right side in the below pic ,there is a lot about the wipers faults. :thumbsup:
http://www.benzworld.org/forums/w140-s-class/1614853-windshield-wiper-problem.html