I assume you have the defective alternator. You can have it rebuilt at a good starter/alternator shop for much cheaper. If you can't find one, the one local to me does the work for the porsche dealership. PM me if you need their information.
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Mike
1990 Mercedes Benz 300 SEL
2001 Mercedes Benz ML320
1999 Mercedes Benz SLK230
1986 Porsche 911 Carrera