Audio Systems: installing aftermarket stereo in 96 maxima, amplifier power, bose systems

Question
i have a 96 maxima with a bose system. i want to install a aftermarket deck (kenwood). My Question is how do you bypass or turn on the factory amp to still use the speakers in the bose system. one stereo shop said it couldnt be done but another said it was just a matter of jumping a wire in the harness. please help as my head unit is dead and i have no sounds to drive to     
                               thanks,
                                    Alvin

Answer
there is two ways to do this take everything out or turn on the amplifier
if they are still good and the speakers the day that you want to get better speakers the amplifiers need to go out at the same time

the only thing you need to do is look for the amplifier power wire in the harness  or go in the trunk and see the color this wire needs 12 volts when the radio is on
but is been a long time so i forgot the color
i done it before is posible ,and it works and sounds good,
you will get some noise and to much power so  to fix that you need a hi/low interface for bose systems from
www.oemautosound.com  www soundgate.com
good luck

http://www.installdr.com/InstallDocs/Nissan/PDF/647021.pdf