She is registered as a commercial towing vehicle in the papers with a towing limit, pneumatic break system being installed, of 6.5 tons... Well, the suspension is certainly good!
A bunch of things so far:
Two wire colors differ between the Autospark harness and the wiring diagram, the one from the ignition lock position 5 is white-orange instead of brown-white (could also be a different ignition lock issue) and the ignition coil wire should be White-Pink but is solid pink on the new engine bay harness. Both are no big deals.
The standard connector for a 7 pin socket is in fact connected to the interior lights. I have to track down a wiring plan of an original 7 pin socket to figure out why and how and all. Foesn't make sense at first glance, but people way better at electrical systems than me certainly had reason to do so.
Also of note, there should be connectors for additional headlamps, and a switch for those. I never saw such a switch anywhere. A pitty really, because using those standard connectors with some rallye head lamps in a 80s design sounds like a cool idea. I need to track those wires down tomorrow, maybe I find the switch that way!
The fun thing is, I do learn a lot of stuff, from accessability to wiring and such, that is incredibly helpfull at work! I should try to put the parts as a tax write off!