Scosche wiring harness for NB Miata with Bose radio.
2000 Mazda Miata
Crutchfield Customer Review (What's this?)
I ordered this product to use in my 2000 Mazda Miata with the stock Bose speakers whilst upgrading to a modern head unit. The install was a bit more confusing than I have experienced in past cars. The Scosche has two different harnesses, but with help from Clint from Crutchfield support, he informed me I didn't need the second smaller harness for my car. The smaller harness has two pairs of speaker connections, and an amp turn on wire. I cut out the smaller harness, and only kept the amp turn on wire, which needed to be spliced into the Miata's factory harness. In my Miata's main radio harness, there is a light green and black wire. That wire is the amp turn on wire for the Bose amplifier, so I spliced and connected that wire to the Scosche's amp turn on wire. . Nowhere in the instructions for the Scosche did it say anything about needing to do this, but if not, the Bose amp wouldn't turn on, and no sound would come from the speakers. Also, you have to find a location to put the black ground wire. It isn't integrated directly into the harness like some other cars. I put the ground wire towards the right of the dash opening, but out of the way of the main harness when the radio is installed. With the new radio, it seems like the stock speakers have improved sound, but if you are upgrading to aftermarkets speakers and bypassing the Bose amplifier, I might use the Metra 70-7901 harness instead. That harness costs less, and may be simpler to use if not using the Bose amplifier.
Pros: This product allows you to keep factory Bose amplifier and speakers while upgrading to an aftermarket head unit.
Cons: It was a more complicated install than anticipated, and required splicing amp turn on wire into factory harness to function.