Have 12v, good grounds and continuity from the ALDL pin to the pcm and no dice.
you generally only need data and ground for a usb ftdi based aldl cable, you can stop worrying about that power wire

where are you grounding the aldl cable to in this test? most cables ive seen use pin 5, but it's possible some use pin 4 (or both)

If it works I can copy the base p66 table from mine onto it and I'd be good right?
not sure what a base table is but you should be able to load whatever compatible bin you want onto another P66 ecm