You have the wrong wire hooked up to the 'remote' input on the amp. The remote input waits for a discrete 12v+ signal from the radio. You have the 'power antenna' wire hooked up to the remote input. The power antenna lead shows 12v+ when the radio is on, but as soon as you change the source to CD, the power antenna drops the 12v+ and shuts your amp off. If you're radio has a blue/white wire, use that to turn the amp on instead of the blue wire you are currently using. If there is no blue/white wire, either the radio uses a non-standard color or the radio does not have the necessary wire. In the case that there is no true 'remote' wire, you can get away with using the accessory wire to the radio. That would be the red one. Jump that one over and you'll be running.
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