I can't find the magic connector in my 3W, but looking behind the fuse box I do see a a gray and black wire in a bundle marked "Morgan Panel Harness". It seems a likely candidate, but I thought I would post it here and see if anyone disagrees with me before I start cutting. Thoughts?
Marked with a red arrow in the picture. If this does work it may be clue for others to follow.

[Linked Image]

2020 M3W