I also have an aux fuse block in place of the stock tool location. Positive came off the battery somewhere and is switched (fuses only work when bike is ON) and I have a negative round terminal with about 8 grounding locations. The round negative terminal is connected to the battery ground and is connected to a bolt at the back exhaust side of the tool bag area.
It was all hooked up by a previous owner to run his GPS, CB, heated clothes and accessories. I have made a few mods to it but it works great! Allows for fused power that only works when switched. If I could ever get my pictures to work, I'll take one and post.
I wouldn't worry about lighting yourself up, it's only a small battery. It's more of s tingle then anything else
Good luck!! I'll be out riding today but available for questions!