[Accelo]

You may be to the point of needed profession help. Access to a scope with current and voltage reading capabilities may be required.

When mine would not start I eventually called in the guy that built my harness.
Turned out I may have caught it if my eyes were younger.
The wires were pined in incorrect locations. (The pin location depends on the view, from the back or the front of the plug) The vendor pined it 4-3-2-1 instead of 1-2-3-4.
If I have better eyes maybe I would have seen the numbers as they were right on the plug, abet behind the silicon sealing ring.

I am not indicating my issue is yours but another set of eyes is always better. Especially if they have some training and tools.
You will find it the last place you look!
Cheers, as you may need some before this is running.