Amazon.com: TYUMEN 100FT 16/2 Gauge Grey/Blue Wire Power Ground Cable, 16 AWG Stranded Flexible Wire for Electrical Wire, Primary Automotive Wire, Battery Cable, Car Audio Speaker, 12 Volt Low Voltage Wiring : Electronics
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. :
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