I am the proud new owner of a 2011 S80. It has two 12-volt outlets, one in the center console and one on the back side of it, neither of which are hot all the time. Does anyone know how to make one of them hot all the time? I would prefer to have the back one always "on" as I carry an electric ice chest with us when we go shopping and not having it running all the time when we plug it in worries me when I have food in it that needs to be kept cold all the time. Any suggestions?