Well, the truck's harness has some some sort of a deeper issue somewhere. I'll have to pull it all out and try to figure out whats going on with it. I have no dome or cab light, the park neutral switch doesn't appear to do anything, and the batt terminals still have no power. At least I can organize it a bit now, its rather messy compared to the TPI harness, which by the way, finally checked out perfectly
The ECM communicates with my laptop, and all the sensors are looking perfect!