you get one of them fuse adders and install it in the fuse box, to a constant power fuse, ( $3 test light helps find it fast) run wire to power port, this way you have a built in fuse for what ever you are powering.
you will need to cut at least the hot wire off your power ports stock wire harness and cut and solider the new leads in, and use shrink tubing, it will last longer in the long run, better than the old cut splice and tape. you tube has some great vids to learn how to solider, its easy.
