Quote:
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How much power does the memory use when the radio is off
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The problem is not the amount of power that it uses when it is OFF,
but when it is ON.
Unless You have a Radio built last century, the
Yellow wire (
constant power) is the
main power source for the radio.
The
Red wire (ignition
switched) just provides a
remote on/off signal.
If You don't have the Radio, buy one with non-volatile memory or just use a media player.
If You already have the Radio, You can add a $5 48v relay to convert Your existing DC converter to be used for both constant and switched +12v power.