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pull back a bit of the heat shrink where I mentioned before. if there is a yellow wire in there, or it looks like a thicker amount of wires twisted inside, they doubled up the ground.
do you have a multimeter? test the yellow against the bare ground on the plug end not in the ptt box. if you get continuity, bob's your uncle!
determining proper ring tip sleeve config will be a bit harder but can be done if you have a multimeter.
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