no voltage going though remote turn on

Connecting the remote turn on to the accessory will technically work.  First you might want to check the settings on your Alpine HU, somteimes the sub/amp turn on come set to off from factory.  It has happened to me and it drove me crazy for a while.  Why the F isn't alpine sending paper manual anymore either???.  Everyone I have put in so far come w/ a CD-Rom, even the cheap ones.   Oh and FYI it's not a Best Buy harness, it's probablly a Metra harness :)  

P.S caraudiolover made a good point, if ou are integrating into the factory bose, you should really consider using a proper integration harness,  BB most likely just sold you a standard nissan harness, go back and ask them for the universal premium integrator harness.