I did the same thing as jaxterra, though I did not use the rear seat brackets as my ground, I used a pre existing hole and used a 1/2 inch steel thread cutting bolt from Ace hardware that was right next to the seating bracket. I tapped into the rear speakers for each side to get stereo. You have to remove the front side trim, center trim, and rear trim by removing the molding first. My wiring was as follows, rear passenger was Brown-Positive, White Negative. Driver side passenger was Yellow- Positive, Black- Negative. Do take note the wiring is twisted together in the harness. They are the wires on the second row from the top so you can use a voltmeter to check for impedance of close to 4 ohms. Just make sure you make contact in th harness as I really had to position my tester leads just right to make a connection in the harness, I removed the door panels to make sure I had correct polarity and color wires. There are 2 screws that hold the door in place as well as clips. Behind the door handle and inside the arm rest. Reason I did rears was because I have the fader positioning 3 ticks down the center as I feel the tweeters are pretty loud ear piercing and I have a much more balanced sound running tone controls as follows: Bass-3, Mid-3, Treble-1.