There are these available http://www.ebay.com/itm/Master-Batte...9UzS6l&vxp=mtr
and if you run another in series inside the car power can be cut from either location.
There are these available http://www.ebay.com/itm/Master-Batte...9UzS6l&vxp=mtr
and if you run another in series inside the car power can be cut from either location.