80' 300cd intermittent wiper not working
 

is relay malfunction causing problem? where is the relay located on non turbo 300cd. thanks

i'd say 9 times out of 10 i find that the switch is bad not the relay.

Anyways, the relay is under the dash on the drivers side, its mounted wayy up near the top on the firewall.

2nd that on the switch ,its easy to replace ,just keep very close attention when taking those ettiiee bittiieee screws out of the wiring housing.A junkyard might charge you $10 for the whole piece just dont mention the word mercedes ,that doubles it .:D

You might also try pulling the cap off the end of the signal stalk and cleaning all the parts inside. I has issues with my wipers randomly turning themselves on and there was some moisture inside under that cap. Once I cleaned it out haven't had a problem since. The cap snaps off, but you have to gently pry it off. Make sure you pay attention to out it all comes apart. There are several parts inside. And don't let the cap fly off, it's spring loaded, and you may loose parts.