Try breaking then re-making the 20 pin connector to panel from main loom. This carries on pin 2 a plain green wire with main power from fuse 9 to the panel. It may be that with your efforts you have already inadvertantly done this hence unable to re-create issue.
Fuse 9 labelled as instruments/mode select also provides power on a second green wire to the stalk switch FWIW.
