Hey, the line out convertor is quite simple, you just tap into the positive and negative of each rear speaker. I am not sure of the color codes for which is positive and negative off hand, but a quick search should find that for you. Also, there is a better grommet closer to the passenger side near the middle where all the engine bay wires come through. I was able to run three runs of 4 gauge through there, so there is plenty of room. then you can run it on the passenger side under the door sills so it is a shorter run.