Battery shutoff switch/radio presets

Do you have the dedicated wire only going to the stereo yellow wire or is the yellow wire also connected to the fuse panel? I used to repair tv's and stereo's and install car audio and never saw one feedback if the memory wire was just ran to the battery but anything is possible. If that's how yours is there must be something in the stereo feeding back and the only way to eliminate that would be to put a diode in line with the stereo's main power wire. Of course that power wire draws a lot of current at high volume levels so a 1N4004 wouldn't even be sufficient. I'll PM you my ph # so if you want to call me and talk about it we'd probably get it figured out faster. Tracy