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If no one can help you here then try renntech.org. Replacing the alternator has been covered several times. You should have almost 14 volts with the engine running if the alternator is charging.
Fully charge the battery and start the car. If the warning light is on with the engine running it is because your alternator is not charging. Make sure your power steering works, because otherwise it is a problem with the belt and not the alternator.
It is usually the regulator that goes out. The regulator is on the back of the alternator. Porsche does not sell just the regulator. But you can buy it from Bosch or other aftermarket part suppliers.
Getting to the front of the engine is not as bad as you may think. There is a service cover under the carpet behind the seats.
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