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Mac VanPelt has the old style schematic diagrams used by FoMoCo.
http://www.vanpeltsales.com/FH_web/F...ing1940std.jpg
Since this was a 6-volt power wire direct to the buss then they may have tapped off of it for under the hood electrical stuff. The bat connection of the regulator would be connected to the cut out pole in the diagram.