For grounding there are two grounds on the heads you will have to pull the stacks and airbox off to get to them. They are by the horn one on each head. I didn't hook mine up to the acc. switch, I just mounted a switch on the frame for the lights. So I just connected the supplied wire w/ the fuse to the positive terminal and went from there with the connections. You can hook it up to the acc if you want I think RJ did his that way.