Not a new question I think but WHY?? I understand positive and negative, maybe even a ground wire, maybe more if you have several different voltages going into one wire... but why so many shapes? There's 4-pin round connectors, inline connectors, inline with a notch or a triangular side, square connectors, square with D-shaped side, square with a notch, plus round OR flat pins, or combinations of the two, or differently angled flat pins.... WHHYYY?
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