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if I purchase radio for my volvo 670 (2005) can i get harness from you to get all 8 speakers work (front and back) as before with my old radio?
October 26th, 2015
You should have all speakers working.  Several of the speakers are working with the factory amp, which will trigger on through the blue wire in the harness.  They are source feed through the speaker wires thast works the other speakers