The wires from the head unit and the wires to the speakers both go to/come from the Bose amp. There's one harness that takes care of it all. So you take out the harness from the bose amp, and use the wires attached to it to hook up to the line-in/speaker-out connections on your 4 channel...
Yeah, ground wire (negative wire) as opposed to the positive wire going to the battery.
I had a similar problem on my HIDs on another car. It was the relay. Water got inside of it and rusted it up. After a while it wouldn't work at all. So I got a new relay free from the manufacturer and...
Some Infinity components. (Note that they're 2 ohms.) For the rear, I just picked up some $20 coaxials that were on sale at onlinecarstereo.com.
I almost went the front-components-rear-bridged-to-sub route, but I like a very full midrange sound with decent bass more than I like bumpin' bass...
I say go 4 chan to all 4 speakers, replacing Bose amp and speakers, ignoring (removing) the Bose "sub." That's what I did, at least, and now I love my car.
I'm sure all or most of you have noticed the vents on the floor underneath the driver and passenger seats for climate control in the back. They ran under and shot out behind the Bose amp and sub when I had them in there. But I removed those two things and put an Alpine 4 chan under the...
Use the wiring harness going into the Bose amp for your amp connections. The single harness has both line in and speaker out wires.
As far as the stock crossover goes, make some wires to bypass it in the door itself. That way you don't have to worry about going through that white thing in the...
Coincidentally, I just did this yesterday:
It's secured with velcro strips and hardwired to the back of the cigarette lighter. No "kit" needed. I just chopped off the cigarette lighter plug and stripped some of the wire to expose it. I unhooked the harness on the back of the cigarette...