I have a one wire 60 amp alternator on my 75 Duster, and my battery is also in the trunk. I added a 60 amp fuse at the battery for the alternator, just incase of a short in the charging circuit. I used a #6 high temperature wire between alternator and the fuse in the trunk. I also added a Ford style starter solenoid to open the hot wire at the battery when the ignition is off, or the kill switch was opened. The solenoid I used could be replaced with a two pole kill switch as stated above. I was able to redo all wires from the engine bay and hide them for a clean look. I agree that all power needs to be off or contained within the battery if you open the kill switch.
