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I'd check the smaller of the two wires that run to the starter motor.You should have 12 volts running to it when the ignition key is turned to the start position.If you do,then your looking at a poor connection between it and the starter or a faulty starter.
If you don't,then it's time to check the wire back to the ignition switch and see where the feed dissapears to.
Corroded connections on the starter are quite common,so I suspect it's that to be honest.
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