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hi!
I'm not familiar with your set-up, but typically the center wire in a coax is the (+) signal, and the mesh (outer wires) is ground. Use a voltmeter to check things out. Use the continuity setting, ground one lead on something metal, then test the two wires. Which ever shows a change on the display (shows continuity) is ground.
Brad
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'78 911 SC
'61 Mercedes 220b
'74 Westy 2.0
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