I went to Radio Shack and purchased one of their Car charger units where you can change the ends on the charger to fit say an Iphone or another end for a Tom Tom and dissassembled the plug and soldered wires to it and wired it to a relay at the battery that turns it on only when the key is on. The cord without and adapter on it fits down the stem of the steering for storage. When I travel I have a splitter to charge the phone and GPS while in a tank bag.