Hi,
You have already verified you have 12V at all three black/white stripe wires.

Verify you are getting a pulse ground on pin 2 of each coil.
You should have pulse ground on coils 1 and 2, but not 3 (cyl 3 and 6) by your description. If this is the case, check for pulse ground at pin 11 of the power transistor (vertical flat electrical unit near oil filler neck over center of engine), the wire is brown/red.

If you have pulse there, there is a break in the wiring. If you do not have pulse there either, you likely have a failed power transistor.

The only other failure points woudl be damaged wiring between transistor and PCM, or failed PCM. Neither of which are at all common. The power transistors fail fairly often however, particularly if you wash your engine with a pressure hose :)

If you need any clarification or diagrams, let me know.

No problem, if you need anything else let me know. When you're done please be sure to Accept the answer to give credit for my input.
We can continue to talk here afterwards as well.