In many applications you can minimize the amount of cable, and the exposure of cable, by running the ground to the switch, rather than the hot lead of the battery. We mount the switch on the right side of the cage at the front edge of the window. A bolt is welded to the cage right next to the switch and the cable from the switch is grounded there, right next to the switch. This gives you a ground wire rather than a hot wire running through the firewall.