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Do you have power going to both the red and yellow wires? The red wire generally goes to a switched power source and the yellow should be constant. Both wires need to have power going to them in order for the unit to work properly.
you may have damaged the battery and may need a new 1 and also check the wireing on the dash board as the perminant live which is the yellow wire could be connected to the live which is the red wire on the radio which keeps the radio on even if the keys are out the ignition
The memory wire is usually the yellow wire in the harness - it goes to a constant 12v (battery) source. That's how the cd player remembers all of your presets. The red wire (the other power wire) is connected to a switched 12v source, so it only sees power when the key is on. That is why the cd player shuts off when you turn the key off.
the cd player consists of 3 types of wires, 1 for negative, 1 for memory- the yellowcolor wire, 1 positive-the red color wire. you must connect the memory wire(yellow) directly to the car battery so that the battery constantly feeds electric current to the player to store your bookmarks or whatever you program it. the red wire must be connected to the ignition barrel( which means your key starter). the negative(black) must be connected to the negative terminal of battery.
As a sanity check run a temporary wire directly from the battery positive to the radio. Twist the red and yellow wires together and connect it to the wire from the battery. If this works either your red or yellow wire connection under the dash or to the harness is not hot like you think. Yellow usually goes to a constant 12 volt source (to keep radio memory) and the red wire to 12volts when the ignition is on. In some radios this is reversed. The test I mentioned will determin if the problem is in the wiring or the radio.