How is it getting a multi path to ground, from the KS ign BEC modification, or from the arduino.

I use a RCexl kill switch setup so the ign has its own battery... the kill switch is opti-isolated from the receiver... signal wire controls ign arm / disarm... how I know is I have the kill switch receiver lead plugged into the output channel of the servo buss ( kill switch channel ), and the servo buss only has the signal wires coming from each of the receiver channels and plugged into the channel inputs of the servo buss, the servo buss has its own battery separate from the receiver, and ignition.