The reason I put the 605 relay in the rear of the car is when you throw the main cutoff, nothing outside a 2' cube in the trunk is hot.
Seen cars burn to the ground because the alt charge wire was hot to the front. I'll pass on that scenario, thank you very much. :)
No, the car will not run with a one wire the way I wire it. The charge line is upstream from the cutoff switch.