I have just about all of the electrical system working now. (There's a reading light that may be burnt out, and the high beams probably aren't wired to anything.) I replaced the 12v flasher with a 24v i got off the 'net, and the remaining weirdness with the turn signals and stop light disappeared (i was seeing 6v on those lines even with nothing activated).
I replaced the corroded rear wiring junction block with a new junction block (now with cover) near the back of the vehicle (underside), and wired everything up with crimped on ring terminals. I ran new wire from the new junction box to the right rear tail light. I even hooked up the license plate light, according to the wiring specs. It all worked on the first damn try. Tucked all the wiring up underneath the dash, secured it, bolted everything down, and attached a panel that stradles the steering column that wasn't attached when i got Elfi. (I recognize what it was after seeing pictures of other Pinzgauers.) I installed the rifle brackets on the passenger side, and bolted on the front license plate. (I did the rear awhile back.)
As far as i'm aware, Elfi is now good to go. :) This was immensely satisfying. I finally understand why so many people enjoy working on automobiles. I took something that was busted, fixed it, following the specs, and now i can drive places in it. If it breaks again, i'll fix it some more.
There's still more to do, of course. I noticed when i was crawling around underneath with the head lamp that the heat-exchanger is missing some ducts to connect it to the heating system. It's also got a few small holes i should patch, too. And i think i'll take it in and get the muffler replaced... supposedly this can be a pretty cheap (like $300) fix that makes the truck quieter.