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Hi, my usb cable has 2 bare copper wires, and no black wires. If I understand correct, at least one of them is the black(ground), but not sure about the other, and
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Amazon.com: KSOPUERT 2Pcs USB A Male Plug to Bare Wire Open End Cable 3.3Ft 100cm 5V 2.1A 2 & 4 Cores Power and Data Transmission Pigtail Repair Tin on The Tail Cable
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