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the ecm switches the grounds. so it doesn't send voltage anywhere.
there is a black/white wire which is powered when the engine stop relay is energized by the kill switch or BAS (the kill switch switches the positive for the coil, the bank angle sensor switches the negative)
when you cycle the kill switch, if the engine stop relay clicks, then you have 12v to your ignition coils, among other devices, as well as 12v on pin 16 in your ecu (you should consider checking for 12v on this pin, connector b (light grey) pin 16, it'll be the only black/white wire in that connector)
the plugs won't fire if you don't have 12v on that pin.