by "automatic wipers" do you mean that you had control over the time delay between wiper swipes?

I'm trying to get my hands on a part MB used to control this feature. On my 124, the intermittent wiper delay is controlled by the N10 relay (for the wipers, rear defog, and turn signals), but there isn't control over the time delay. It's just set to about 6-7 seconds. If I can get a relay that has the circuitry for an adjustable delay, I could create an easy mod.