No. The second small wire is a feedback for the engine computer according to my shop foremen. They've been working on Mercedes for 20+ years so I'm inclined to believe them. I tried powering and grounding the second wire while the fan was running and while it was stopped. I got no response.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
