I answered this question not that long back, I can't remember what it was though I'm afraid....................... that grommet is the easiest place, drivers side is a big PiA....... Actually if there is a fuse in the box on drivers side of eng bay for high beam I would use a piggy back fuse holder for the trigger might even find a supply circuit there as well from which you can draw power, used that idea in other vehicles with success before and saves a lot of agro.....