Crumple up a piece of tin foil around the end. Make sure it won't fall off and bridge the walls (negative) with the tip (+). Ghetto but effective if you only ra

Crumple up a piece of tin foil around the end. Make sure it won't fall off and bridge the walls (negative) with the tip (+). Ghetto but effective if you only rarely unplug it. Alternatively, solder wires onto it and plug them into your fuse box. Add an inline fuse for added protection.