Thanks for your reply.
In fact, that's how they're meant to work.
I've checked my loose connectors behind the headlights and they are dead when I spray water on the windshield, so I guess they're there for other thing than headlight wipers ( fog-lights, perhaps?! although mine have another connection...)
By the way, I drive a '92 240 GL station wagon. 180.000Km on the clock and cobalt blue!
I've found a diagram on the net and apparently both wiper motors should have the earth connected directly to earth points on the inside of the front fender panels, while one of the cables goes to the intermittent wiper relay close to the fuse box, and the other one goes to the 2nd fuse.
Tomorrow I'm doing it, hope I'm not blowing the whole thing...
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