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You can try to "bridge" the ground to see if that's the problem. Use a jumper cable (or maybe two of them if not long enough).............and connect the negative of the battery terminal to somewhere on the transmission case close to the starter. If the car starts, then there is most likely a grounding problem.
We tried this setup previously on a car (not a Porsche) and were able to find a bad ground strap going from the body to the engine.
Good luck!
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