In google, I typed "grip connector site:stromtrooper.com" and found many posts related to that connector. This one has some photos: https://www.stromtrooper.com/forums/s...d.php?p=324553
Mikefryman is correct though, it's proximity to the engine electrics seems to induce a high-pitched whine that is noticeable when I'm stopped. I had blamed it on a cheap pre-amp that I use. That said, Mike's use of the tail light power is a reasonable choice. I still recommend finding the negative wire from that same area.
It's been written about many times in this forum, but aluminum and steel have different molecular structures. When in contact with each other in the presense of moisture, the aluminum transfers electrons to the steel. If it's allowed to happen, oxidation (corrosion) occurs on the aluminum, sometimes burrowing deep into the metal.
The process is greatly accellerated if an electrical current passes between them. By grounding accessories to the frame, we are making that aluminum-steel junction part of the electrical system and inviting the aluminum to further sacrifice itself in the process. Suzuki engineers knew this and took steps to isolate the frame from the electrical system by providing a wired return (ground) for every component.
Search the web for terms like Dissimilar Metal, Galvanic Corrosion or Corrosion Potential Charts for further information.