remember if you cut the battery wires as above it will not 'cut out' the engine if it is already running as the alternator will feed the lectrics, you will need an FIA cut out switch with ballast resistor or add your own. Also without a ballast resistor you can damage the alternator if it is knocked by a passengerby mistake. Yes this happens frequently but have made a device to stop that now. Remember that if ypu have a winch it will need to handle lots of current my switch is 200Amps @24V.