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There are at least three versions of that green wire. They have in common, a coaxial scheme where the center carries the points open/close signal forward. Early wires have a copper braid as a shield that terminates in an eye. Later wires terminate in a plug that resembles an RCA jack.
From the factory, the early wire runs to a small block and from there, the shield is grounded and the center core wire ties to a line to the transistorized box.
It is a common to bypass the transistorized box (which can be fixed with an over the counter transistor if needed) and hook the green wire straight to the coil. Of course, it is equally easy to connect it to the wrong terminal on the distributor, which makes for a very inefficient ignition system.
-CTH
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