Something you might want to consider, add a few ground wires. I do this on every thing I add things to. you have this super high power amp on fat wire pulling lots of power right? well you string a wire to the + on the bat and then run the - to something metal. well take a look at how that - off the bat is connected. On most things its 1 little 10 gauge wire. so What I do is add a few wires from the - on the bat to the frame in a few locations. This will allow the frame to handle more power draw. on my truck I added 2 on each side to existing bolts. Just slip the spade connector under a bolt and connect it to the - on the battery .
ALso make sure that you put a fuse on all + wires you add and make sure that fuse is as close to the battery as you can put it (like a couple inches not feet!)