So... updates... hrm.
Changed the upper steering column for a 91+ unit. Not so happy with that, to be honest, I think I'll switch back. Probably going to mod my old 89 unit so all the controls still work with the newer under dash bits. The newer system doesn't feel as solid as the old one - maybe the one I got is worn or something, but it wobbles up and down by a bit. My 89 unit is rock solid.
Changed all the lock cylinders to the newer style from 91+ as well. Now I need to find a fancy Toyota key and get it cut to match. While I was in the doors, I remounted my speaker crossovers, and finalized the wiring to the speakers. Never was happy with the original mounting system I came up with for them... now they are actually screwed into the door, on the metal skeleton. There's enough room in the lower front to mount them out of the way of the glass mechanism.
Finally drilled out the last plastic panel in the hatch for the battery cut off switch and installed the panel. The hatch is finally starting it's journey to respectability to match the rest of the car!
Traced down my problem with the rear window defog - turned out to be a burned connector in the top driver side of the hatch, right where the hatch connects to the body wiring, but on the hatch side. Looks like a fair bit of water got in there somehow when it was on, caused some shorting, and burned out that pin on the plug. How the wiring for the 3rd brake light continued to work is a mystery. Pulled the entire hatch harness out the bottom, unwrapped it, cut out the fried wiring, put in new stuff, wrapped it all back up in the stock foam and re-taped the harness - would you believe Toyota taped those wires, then wrapped them in foam, then taped 'em again? Sounds like the design engineer on that bit was just as paranoid as, well, me.
While I was on the trail of electrical gremlins, my buddy brought over his '68 Lincoln and we fixed his lack of headlights. Turns out the headlight switch on those has an integrated circuit breaker, and the damn thing couldn't take the power required by modern lights. Which is really odd, because the wire they used for the lights is MONSTROUS! Easily 4 times the size of the Toyota headlight wiring, anyway. So I put in a modern day relay triggered by the old headlight circuit, and now he can drive after dark.