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not sure how helpful it is, but the car's an '82 SC, and it had A/C,
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Yes, the type of car you are working on is important. The earlier narrow bodied cars have a much simpler wiring setup. Here is a good link that includes the following information:
For an early SC like yours, the Yellow wire, terminal 50 at the switch and at the starter, has a long route. It goes from the switch, through a bulkhead plug, to the 14 pin engine compartment harness, and on to the starter. Disconnect the plugs and clean and separate the pins with a razor blade. Since you had A/C, there is also a double plug coupler buried in the heater box, that taps the yellow wire to the A/C relay in the smugglers box. The yellow wire is also tapped into the heater ventilation switch. You need to trace, unplug, and clean all of the connections. Since your A/C has been removed, I'd start with those connections first.
http://forums.pelicanparts.com/porsche-911-technical-forum/506935-have-replaced-about-everything-still-no-juice-starter.html