The V1.0 Wiring Harness is a bit of a mystery. There is no complete schematic document of it yet because it was changed heavily up to the last second. An outdated harness schematic can be found here.

Philosophy

There are two physically separate wiring harnesses: the high voltage harness and the low voltage harness. They are completely isolated from each other to prevent transients from the ESC's from damaging the computers attached to the low voltage harness.

Communication between components from the two harnesses is achieved via opto-isolators. Currently this is only required for the battery monitoring and for the commands from the flight controller to the ESCs. However, in the future it could also include a signal line that allows the control board to entirely disable (but not enable) power to the motors.

High Voltage Harness

The high voltage harness delivers power from the 6 Cell 8-10Ah LiPo batteries to the ESC's (for the motors). It is also used to power the emergency kill board and the battery monitoring board. As discussed in the e-kill board documentation the E-kill board is able to disable power to the ESC's.

Low Voltage Harness

The low voltage harness runs off a 3 Cell LiPo battery. It powers the Jetson, Flight Controller, and all the sensors.