in this photo, my power wire is covered in blue wire loom (obviously) at the very back top of the engine bay, you can see it going to the grommet i was talking about on the left of the two fluid resivoirs
i have mine on the passengerside grommet, just punch a hole through the rubber and cardboard, ran a 1gauge wire through np. just be sure to seal the hole cause i got a nasty case of wet carpet syndrome.