Your battery charges while the engine is on from the alternator. i just run one power cable from the battery then into a distribution block on the amp rack somewhere.

I made my amp rack designed the way it is because my sub box cant be pushed all the way back to seat so i had space in between the box and the seat.

That makes it perfect place to put the amps hence my amp rack design!

 

ok. thanks. i will try and post pics.

 

MJV: Yes I did have to put some extra power in the back for everything.... Im running 3 batteries total in the car and a 2.4 farad capacitor. I would highly recomend a cap if you have the money.... well worth it. I also have a Dc-ac power converter in the back for the 20" flat panel tv, so one battery is mainly for that and the PS2.