I am in the process of adding a USB connection to my 2015 rt. I purchased the unit that sits in the middle of the switch bank under the handle bars and now starting to work out how I am going to get power to it. Most of the fuse banks I have found have only a positive connection so I would need to find a seperate ground somewhere. My question is do you usually run a ground back to the battery or do you ground to the frame somewhere? If you ground to the frame, where do you do it?