The controls on the stereo in my '08 Niagara have gone goofy. I am considering replacing it with a new pioneer stereo, but I have a few questions: 1) Is the wiring (color coding) the same? If not, does anyone have the wiring diagram for the stock stereo? 2) Will the new stereo have a larger drain on the battery than the stock stereo when I'm unplugged? Should I add a kill switch, or will removing the face on the radio stop the battery drain? 3) I have read about placing a 9v on one of the power leads to keep the settings when the battery is disconnected. How is this wired? Any other pointers/comments would be appreciated. Thanks!