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My understanding is that when you shift and the RPMs drop the alternator (with a seized pulley) will be pushing the the accessory belt and/or the belt has to act as a brake on the alternator. A working pulley will reduce wear and tear on the alternator and belt.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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