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Old 08-29-2007, 03:51 PM
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Join Date: May 2004
Location: Reading-England
Posts: 116
Electronic Speedo, (from mid 80's)


I have an AMG W124 with a M117 engine block and S Class (W126) Gearbox.

The speedo+mileometer has just stopped working and thinking it was a standard W124 speedo problem I took the car into my local Merc specialist who pulled the instrument binacle and promtly told me, "Sorry, can't/don't want to help" as it appears that my W124 has an electronic speedo and my Merc specialist does not have a wiring diagram as its a bespoke wiring system on my car

Can anybody tell me what I/auto electrican should be checking out gearbox pickup? there a speedo relay in the system?...if so where do you think its likely to be hiding?

Lastly, if the instrument cluster has broken can they be repaired, ie if its a fault in the printed circuit....the instrument panel on my car is an AMG item so I don't want to have to get rid of it. By the way everything else in the instrument panel works, ie rev counter, oil pressure etc.

Any help would be greatfully received.

Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500

Last edited by Vladamir; 08-29-2007 at 04:11 PM.
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