Normally red. Check the wires with a volt meter to be sure.
power is red ground is black
red
Don't know the color of the wire but you will just have to use a test light to see what wire is hot to the radio.
blue and yellow
You likely do not have the "Constant Power" wire connected at the back of your radio deck, it is often yellow in color.
In a 2001 Ford Focus, the radio power wires typically include a yellow wire for constant power and a red wire for switched power. The yellow wire provides power when the ignition is off, while the red wire is energized when the ignition is on. Make sure to check for any blown fuses and ensure proper connections to these wires for the radio to function correctly.
The constant power wire for the radio in a 1990 Ford Thunderbird should be green/yellow. The ground wire for this vehicle's stereo system should be black/light green.
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You have to go to the Power Plant and return power to the Radio Station.