The monowiper started acting sluggishly, sometimes stopping in mid-stream. So I swapped, one at a time, the fuse, relay, combination switch stalk at the steering wheel and the wiper assembly itself, with known good ones from the parts car. Still not working correctly, whether engine is running or not. Bent the wiper arm to relieve downward pressure. Even switched wiper blades. Battery is good- its starts the car. Any other ideas? I am considering going back in to check the female plug that attaches to the wiper assembly to see if any of the wiring or pins went bad. Oh yes, when I detached the wiper arm, the wiper stub seemed to move properly, and quickly at the high setting; with the wiper arm reattached, its sluggish. Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)