Sooooo after looking at the wiring diagrams and seeing that pretty much every affected system relies on the main/fuel relay, I pulled the "known good" main relay and was planning to make it into a bypass test relay, and then looked at it.....
Cracked solder leads! Lots of them. I don't know if this is the problem, but maybe it is. They relay wasn't clicking while I was driving, but that doesn't mean power was getting through all the pins.
So, once I get a new (used) turbo installed, we'll see if that was it.
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