A very helpful document throughout the entire project was a proper wiring diagram. The quality of the printouts and handbooks I found so far are pretty bad, so I made my own high-resolution version which gives the option to zoom in and follow the wires closely. The type is still not the greatest, but nevertheless it is way better than having no diagram at all.
It is for a 1990 Mitsubishi l300 with manual transmission from Europe, so some parts might be a bit different to your Delica.
The PDF-file is 8MB and might take a while to load, depending on you connection. If you want to download, just use the button on the right upper corner in the viewer below.