Ebay.

There are two part numbers of replacement harness. 124 440 5632 which is for M104 W124 cars built '93-late '94 and 124 440 2933 for cars in '95.

Both replacement are made by Delphi. Delphi were making them for Mercedes from approx 1998.

The delphi labels were either grey or white with the part number written on it. The white label later harnesses are better.

Expect to pay $200 - $500 for a used replacement harness.

Search by part number on ebay.

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David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109