Without a diagram of the radio I cannot help a lot. If the radio is on and not losing preset stations when it comes on it may be getting power to the memory keep wire.
If it was mine I would pull the radio out and find out what is going on with any power wires. In any case, add a simple on/off switch next to the radio and then you will not worry about running your batteries down if not connected to power.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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