A couple years ago I installed a marine duty fusebox for some aux equipment -- heated clothing, LED driving lights, etc... under the seat of my 08 Vee just to the rear of the battery. I have seven lines running off it -- all low level current. Currently it is powered 24/7 the way I have it directly tied to the battery. I want to make it switched. I'm thinking it to be a simple process of pulling power from the brake light line (which is switched) and running it through a relay and the fusebox power through the relay. I will never ever run all of the items hooked to this aux fusebox at the same time. What sized relay should I be using? Is it the mathematical sum of all that is hooked in, or can it be less?