If your car is like mine, all the aftermarket electrical devices create a tassel of wires to the fuse box. Most of these wires end up ganged into one or two switched power leads on the fuse box. I built a small aluminum underdash panel by mounting a 40-amp relay, a battery positive terminal that came off a junkyard S-10, and a multiple connector power strip from the Shack. This allows me to remove all but one of the switched power wires from the fuse box and connect them to the power strip using a single switched power lead from the fuse box to trigger the relay and energize the power strip. It’s simple and reduces the load on the fuse box.