Thread: Is there an easy way to diagnose a non-functioning speedo 300SD?
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Old 08-15-2010, 10:30 PM
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Wodnek Wodnek is offline
Vintage Mercedes Junkie
  
Join Date: Jun 2004
Location: Southeast Wisconsin
Posts: 1,661
If it has a cable then here is a way.

Pull your cluster. Drive the car forward, or jack up the rear and just run the car in drive. Watch and see if the cable is spinning. If it is spinning, squeeze it gently with your fingers and see if it is spinning with at least a little bit of torque. If it stops with the slightest pressure, the sending unit may be the issue. Not spinning at all is likely to be a cable.
If the 126 has an electric speedometer, then this is obviously of no value. I never had a 126, so i don't know.
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1978 450 SEL 6.9 euro restoration at 63% and climbing
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