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That information is not found in the manual. The manuals are released by the manufacturer of the piece of equipment. Stereo manual came from the stereo manufacturer. Fridge from the that manufacturer, etc.
Remove the radio, locate the power and ground wires:
Black = Ground
Red = power
Yellow = power
One power will be switched and the other constant to maintain memory. Put a volt-meter on each circuit and make sure you're getting 12v.