Wiring plan. All this is necessary to deal with Electronic Speed Controller (ESC) needing to be armed
every time it operates. Manually arming ESC... possible but not happening here. Why bother with ESC? Because there's no other way (I've found) to move big air through this "ducted bucket system" than with a brushless motor spinning a robust turbofan.
4-wire cable goes through engine-bay-to-cabin bulkhead---plan is to run this cable into cab next to DMI harness. Arduino and ESC are headed below-dash somewhere. ON/OFF for turbine is activated by circuit from compressor---when compressor is ON... turbine is signaled ON. 12v power feeds into ESC. When ESC gets 12v, BEC cable off ESC supplies 5v power to Arduino (no step down needed.) Arduino is programed to first arm (initialize) ESC... Arduino program then instructs ESC to accelerate turbine to a defined speed. (Defining what speed will require a few test runs to sort out.) Program/sketch is possibly ready. Am waiting on Arduino to arrive to get on with this. Am collecting cable & bits today.
Also waiting on smooth bore flex ducting. When it arrives, one more test-fit is called for to get a final install measure for all parts.