“I purchased today, matched all the wires by color, connected with proper connector, plugged it in my 2004 chevy sub with the proper plug NO POWER??”
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Your main power wires for the radio are black (ground) red (accessory) and yellow (constant) all these 3 wires need to be connected correctly for the radio to power on. You can always have Best Buys installation team test the radio or have them do the installation for you.
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