WELL DEPENDING ON WHERE YOU WANT TO INSTALL YOUR CD CHANGER WOULD DEPEND ON WHERE YOU CAN GET THE 12V TAP. NOW, IF YOU'RE GOING TO INSTALL THE CD CHANGER IN THE FRONT, THEN I WOULD EITHER RUN A STRAIGHT POWER FROM THE BATTERY ITSELF WITH A FUSE TO THE CD CHANGER, OR NUMBER TWO, YOU CAN PULL OUT YOUR RADIO, DISCONNECT THE WIRING HARNESS AND WITH A SIMPLE POWER TESTER, YOU CAN FIND OUT WHICH WIRE IS HOT... JUST SPLICE INTO THAT WIRE AND CONNECT TO YOUR CD CHANGER.
NOW, IF YOU'RE GOING TO INSTALL FROM THE TRUNK, LOCATE YOUR FACTORY AMP, DISCONNECT THE BIGGEST HARNEST AND WITH A SIMPLE POWER TESTER, LOCATE THE HOT WIRE AND SPLICE INTO THAT THEN CONNECT TO YOUR CD CHANGER.
I'M CURIOUS, I'M THINKING YOU NEED MORE THAN THE 12V WIRE TO MAKE YOUR CD CHANGER WORK. I INSTALL AUDIO EQUIPMENT AND TO MAKE A CD CHANGER WORK PROPERLY, YOU NEED A GROUND, POWER, AND REMOTE WIRE. THAT'S JUST TO POWER THE SUCKER UP, AND FOR SOUND, DEPENDING IF YOU HAVE RCA PREOUTS OR NOT WILL DEPEND ON THE SOURCE OF YOUR SOUND. HOPE THIS WILL HELP YOU OUT. GOOD LUCK.