Connect these (splice, crimp, solder) to some spare wire and label accordingly (R-, R+, L-, L+): 5. Using quick splice terminals, connect the appropriate wires from the patch cable to the wires on the Bose amp harness, and your amp turn-on cable: 6. Plug the RCA patch cable in to your amp input, and attach the cable from the Bose amp turn-on. A 2008 Nissan Altima Stereo upgrade on a non-Bose system is almost exactly the same. f it's the premium sound system it has an amp. Whether your an expert Chevrolet Silverado C1500 mobile electronics installer, Chevrolet Silverado C1500 fanatic, or a novice Chevrolet Silverado C1500 enthusiast with a 2008 Chevrolet Silverado C1500, a car stereo wiring diagram can save.