Radio and clock permanent live?

[Mitch]

Basically every time the car is turned off all radio settings are lost and the clock resets itself back to 1200am, I have tried swapping the yellow and red wires around on the stereo, no difference, checked all relevant fuses, all ok, when the key is in the ACC position the battery light is lit up but neither the clock or radio will work unless the ignition is fully on? Any help appreciated