I am working on the same issue too. When I asked my dealer to install the heated grips, I was surprised that they never connected the power directly to the battery, but instead they tapped the wires that are connected to one of the auxiliary lights. In my case, it's the left auxiliary light connection they used. These wires are located under the black plastic cover under the instruments. The plugs are in white color on both sides. I think they are parking lights which only turn on when the ignition key is turned on but the engine is not started. I tried to post the pictures, but I am having problems with the technicalities of this forum. Picture this nonetheless, a blue and a black wire go into this small white plug that connects to an auxiliary light. The dealer simply divert the blue wire into two 'red' wires, and the black wire is split into two black wires. So the extra 'red' and black wires are used as a power source for the heated grips. Of course, they keep the fuses that come along with the heated grips. So in theory, I don't see why I cannot use the right auxiliary light connection as the power source for the GPS. Having said that, I feel safer by just connecting the power directly onto the battery, I just have to make sure that whatever socket I get will have a fuse and long enough wires, because the fuse will protect from power surge and the long wires to go a long way under the tank (if I can fit through them without removing the tank) to the handlebar.