Which wire to the transmission powers the digital odometer on a 1994 Merc C250 diesel . I believe this transmission here is the same as the C 240 and 280 , years 93 -96 . There are a bunch of wires in the wiring loom going to the transmission . I assume its one of these . My Merc has 267,000 kms on it and this model was known for wiring loom issues where the plastic got brittle and fell off the wires . I assume this is why my odometer is not working . But which wire of the 4 in the harness going to the transmission is it . Any clues anyone ? .