Changer isnt working C4

[Yogivette]

OK EVERYONE HELP PLEASE, So i have a JVC 12 disc changer...the kind that runs through the radio. It has the antenna, the ground (black wire), and a yellow and red wire (im assuming acc and constant power respectively). It was working with just the yellow wire, all though only when the car was on of course, and then i went in and got the red and pink/white put together and it would still only work when on (I.E. wouldnt remember where the cd was or which cd was out). Then i put it back into the console and now it doesnt work at all (well display and sound wise). I think something may have happened to the wires when putting the tape deck back in the console but i dont know...but why wouldnt the constant on keep the changer powered? Would it have to be some problem between the wires from deck and changer (which all came with the changer no sodering)? i cant figure it out.