I just installed my amp and sub using the convertor today. I went to Best buy and bought an RF 8 gauge wiring kit (which included the main wire that goes from batter to the amp, a ground wire, and fuse) which was 40 bucks. Then I bought 3.3f RCA cables which were like $3.50. And finally the inline convertor which was $23 bucks. Dont buy the big wiring kits that are like $100 because they have long RCA cables which you dont need.
We wired the main wire from the battery, through the drivers side door, on the floor and to the back. I had to pull my backseats off so I could easily slide the wire into the trunk.
Then pull the connector that has like 20 wires from the back of the stock amp. Its a white connector. The wire that I used was a green wire with a silver line through it. Dont cut that wire, but just strip it of its insulator about 3/4". Then take another separate speaker wire, rap it around the uninsulated part, and then use some electrical tape around it. This is called the remote turn on wire, which will later go into the amp, and turns the amp on and off when the car turns on. After you have it connected, put the white connector back into the stock amp.
This is a long post, but bare with me, Im explaining on how to do a hard process. I would recommend printing this out and reading it carefully if installing it this way.
Then running from each of the 2 speakers in the back in the trunk, you will see 2 wires. The right speaker has an orange wire and a black wire. The left speaker has a green and black wire. Strip all these wires of its insulators about 1/2" or so. Attach to the each of 4 speaker wires (2 for left speaker, 2 for right speaker) a separate wire, which is about 3 feet long. You will need these to connect your inline converter soon.
Take out your inline converter, and look at it. Mine had 6 wires running from it. 2 brown (which you dont need, dont worry about it), 2 white (1 plain white and 1 white/black) and 2 gray (1 plain gray, 1 gray/black). Now make sure you dont get this mixed up....Attach the plain white wire to the black wire on right speaker (attach it to that extended wire that you ran). Attach the white/black wire to the orange wire on the right side. Attach the gray plain wire to the black wire on left side, and attach the gray/black wire to the green wire the left side.
Now your inline converter is plugged in, which is probbaly the hardest thing to do. Then just plug in the RCA cables from the inline convertor to the amp.
Attach the remote turn on wire that is coming from the stock amp connector, into your new amp (there should be a spot there). Then just connect your subs into your amp, and you are ready to bump.
Did I miss anything? Its been a hard day trying to install this, and Im just recalling everything I remember. Peace