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My USB cable has 4 colours, red, blue, brown, and yellow. What are the positive and negative? - Quora
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wiring - Which wire is positive on this audio jack (blue and white)? - Electrical Engineering Stack Exchange
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How to join Wire color blue, black and white with wire of just red and white - Quora
which wire is positive and which one is negative? Talking about the blue and yellow wires. I'm trying to install some car speakers but don't know what color is positive or negative. :
Electrical Wire Color Codes: Everything You Need to Know