I have a problem with the rear indicator on my 300TDI 90. It stops working as if a bulb has gone in the rear lamp and blinks fast like a fuse has gone. However it is not the bulb as I have changed this and no joy or a fuse as it sometimes works again. When you take out the lamp and move the wires it sometimes works and then stops again. I figure it is either damp or a corroded earth wire?. So I sprayed the rear of the unit with WD40. This worked for about 3 days and now it is happening again. My question is: Is it dodgy wiring and how do I replace the complete rear indicator unit or don't I have to. I cannot see how the wires are crimped into the back. Any help would be most appreciated.