Porsche This 12 volt, 175 amp alternator fits 911 Carrera and Turbo models. Years 1983-1989. Based on an OE Denso Hair Pin alternator and built to use all OE connections. With an internal regulator and external fan, it comes with a 21mm spacer to adjust the pulley spacing. This is a direct replacement with double the performance. The alternator puts out enough power to run air conditioning as well.