It's probably a dirty ground wire from the trans to the body located at the forward part of the transmission.
A good troubleshooting technique for a 914, but can also be used on the 911: https://www.pelicanparts.com/techarticles/mult_starter_diag/mult_starter_diag.htm
Edit - they do have troubleshooting for the 911 that includes the ignition switch:
https://www.pelicanparts.com/techarticles/101_Projects_Porsche_911/87-Starter_Troubleshoot/87-Starter_Troubleshoot.htm
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
Last edited by Walter_Middie; 04-08-2019 at 12:35 PM..
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