Last year we purchased and installed a new VHF radio. In fall we had to cut the wire to the power to remove it for the winter. Now it is time to put it back in. How do others wire it so it can be plugged in instead of cutting the wires each year? The red wire already plugs in cuz it has a fuse in it. So we need something for the black wire. Radio Shack, Lowes, and an auto store were not helpful. Any ideas?