[koates]

You need a heavy duty switch rated at 200 amps plus because that is what the starter motor can pull on cranking a cold engine. Mount it by drilling a single hole in the metal floor pan in between the front of the seat and the rear of the battery access panel. The knob or lever is inside and the switch body is under the floor. Connect the battery earth cable through the switch terminals. Very easy to operate even whilst driving if you need to. My knob is under the rear edge of the floor mat and is not seen. You can operate it while sitting in the car and nobody sees you doing it. Ideal anti theft device as well. I have this set up in my 34 Ford V8. Regards, Kevin.