The idea is to have all your relays in the same spot. Less ghetto wiring in the jeep the better. When you start to add relays most people just put them the easiest place they can and its not always the safest or smartest place to put them.....then they add another set of lights....and then a locker....and then another....you can see where this is going. So you run Cat5 cable that keeps all the switch signal wires in a nice neat fashion then you can centrally locate all your relays to one spot so you only have one power in, one ground, and then your switch signal Cat5. Cleaner and smarter set up than most but it requires a bit of thinking and effort on your part.