Alibro said:

If it was REALLY complicated I wouldn't be able to cope.
Like I said, I connect one wire at a time and after many hours the number of wires has reduced by a few.
Some day they will all be connected.

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You can't make an omelette without breaking a few eggs Ali.
It looks complicated from a bystander's point of view, but dealing with one wire at a time is the way to get through the project.
Keep up the good work.

So the goal for today is to get the coolant pump controller Arduino installed then the charger.
While the new VCU can theoretically send the required 2hz PWM that the coolant pump needs it is not simple and I have another reason to go with the Arduino, ie controlling overnight timed charging.
The pump needs to be running correctly before I try to charge the car to avoid damaging the charger.
I'll report back later with the progress.