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Sounds like the ignition switch.
You need PN# 4A0.905.849.B . Porsche doesn't want to sell just the electrical switch anymore, they want to sell you a whole new Unit - more work and more $$.
This switch is made for Porsche by MEYLE Products in Germany and their PN# is 100.905.0000 - it is a direct cross-referenced replacement.
Do a search here and in the DIY section for replacement instructions, should take you under 30 min. to switch it.
Then to test the Battery/Alternator, use a DMM to check voltage between the battery terminals (Car OFF) - s/b no more than 13.2volts. Then start the car and check again. This time, the DMM should read between 13.8-14.2 volts - this is the alternator voltage. If higher, it could be cooking the battery because the internal voltage regulator has blown 1 or all of it's diodes.
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