I have a 93 300se, the wipers are only working intermitantly. I was told it might be a bad relay switch. Can you tell me the location of the relay for the wiper system.

Hi,
it's a combination relay in the elctric center/ fuse box front left.
You can identify it by feeling the klick when your wipers are working on intervall.
I had one with a bad socket before!
All the best,
Dokta