Join Date: Dec 2005
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You need to run an earth wire from the wiper motor mounting to the car body.
There is an earth under the dash somewhere that corrodes and causes the problem,but I have found that running an independant earth to the motor works just as well to fix the problem and I am yet to have any further problems with repairing one this way.
Good luck and let us know how you get on.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo