I have a 1997 INFINITI I30 with a premium Bose sound system. I ordered a wiring harness from Crutchfield.
PAC ROEM-NIS2 Wiring Interface (Pac-audio.com)
I am installing this aftermarket radio unit
Pyle Radio (PLTS78DUB)
I spent all day soldering wires and testing the radio. I have an A/C to D/C home adapter and verified the radio works, but I get no power once inside the vehicle. I did notice the factory radio would not turn on if the Antenna was not connected, could that be my power issue?
Another issue I'm having is wiring the speakers, I wired the power to the cigarette lighter temporarily, the harness has both High level and low level speaker hookups, I attached the low level, and I get no sound, Its already dark outside, I spent my entire Sunday doing this and I also called Crutchfield and Had gotten an incompetent tech agent, he couldn't help? Interesting huh, I think his name was Jack, anyways, he claimed he couldn't hear me clearly, that my phone was static, Since when are new phones static, there all digital .

 

There is a dedicated audio forum, might want to check there as well.

Recently installed Kenwood aftermarket radio in the 2003 I35 with stock Bose and ended getting the best sound by using the Metra 70-7550 harness. Even though the head unit has 5V pre-outs and initially went with the Crutchfield's recommended Metra 70-7551 harness, the sound was no good.

I think the Bose radio gets its ground from the antenna. Make sure to run your ground wire from the aftermarket head unit to the chassis.