BenzWorld Senior Member
Date registered: Nov 2009
Vehicle: 1984, 201.122, OM601.921, G717.410
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Replacing the speedometer cable is no guarantee that you will repair the cruise control. That is like trial and error with accupuncture.
I suggest troubleshooting the cruise control system using an electrical rather than a mechanical approach. Start in the middle and work out. (To guess a number between 1 and 100, start at 50).
On early models, the speedometer sensor on the back of the instrument cluster is a transformer, not a Hall sensor.