thanks all for the advice.
So, got the tag light working. Ended up being a bad connector, spliced in a new one, good to go. Connections soldered and wrapped in heat shrink. One gremlin down.
Did some poking around, found that the dome lights were non-functional due to the fuse being pulled. Replaced it and.... They won't turn off. Explains the pulled fuse, haha.
There is also an extra wire jumped into the interior fuse box, under the DRL fuse. Not sure where it leads, appears to go through door jamb to underhood area, then disappears into the factory split-loom, near the battery.
I'll poke around more this weekend when i have the time.