This is another age old question. here's the history. Bought the car with a transmission that was installed by local Mercedes dealer. only has 20k on it. $matic light never came on, suspected it was removed. Got a little crazy in the rain and the car started spinning but ! light flashed and all of a sudden it hooked up so i assumed it was working. There are NO ABS codes. ABS works. I recently have had it spinning tires frequently and no the 4matic is not working. Put a bulb in and it is lit constantly. If I removed battery cable for some time it turn the light out but it will immediatley re-light after starting car. I have checked brake light switch on 4matic side and it is normally closed which i think is correct? Can anyone help?

Marty
mberdinka@yahoo.com