Just been through some of this with the pick-up coils in the old TI GM distributors. With those units, the solid white wire would be considered + and the white/green tracer would be considered -. In an HEI unit, the solid white would be considered + and the green considered -. There is a running test that can be done to verify if using an MSD if that's what you are doing. I can expand if this helps in anyway.
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