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Glen, search here for "blue wire" for a detailed explanation of how the system works.
You have a more immediate issue which is you need a new battery. 11.21 volts is so dead that nothing will bring it back, and even if you did get the system to start charging, trying to bring back a battery from that level will cause the alternator to overheat and cook things.
For reference, 12.25V = 25% state of charge. Our alternators are designed to bring the system back from a long period of cranking, like in the winter, maybe a 3-5% drop in charge. They are absolutely not designed to bring one back from deep cycle.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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