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The pure logic does not necessarily need a common ground with the locomotion components. But often the rather high current carrying driver circuits are part of the logic circuit board. Those current carrying driving circuits need a common ground with the other high current electro-mechanical locomotion parts. That could be a justification for common ground everywhere.
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79 SC Targa
72 T Targa Sold
68 T Coupe Sold
65 912 Coupe Sold
62 356B Coupe Sold
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