[The vast minority]

Many diagnostic tools will show voltage at the OBD port.

Have a smell of your alternator, does it smell like an electrical burn smell in the area.

I have also just fitted the alternator that you reference above, shown here with my old one.
The old one was shorted to earth on 2 of the 3 windings.
My car is much older and is a 2.7..

 

[The vast minority]

Thank you for the pictures. I checked mine with an endoscope camera. I have exactly the same Denso type. So I think, there is a mistake in the manual. This type is a 150A alternator.
View attachment 192921

View attachment 192922

Dirk

Great progress, if the original Alt is the same as my old one, @150 amps and we know that the Lucas LRA03641 you have identified is an effective replacement, as it is in my car, then happy days.
I did a how-to guide on this job very recently. If you have not seen it, the link is below.

The plastic bottle in the shots was there to cover the alternator live lead. I had to run the car with this lead disconnected to move it and get it on the ramps because my alternator was so badly shorted to ground.You wont need this of course, because you are still able to run the car.
Im 99.99% sure that the same process to get the Alt out and back in again will apply to the 3L engine.

Al

X250 2.7 V6 alternator removal and replacement.

 

[The vast minority]

Know what ? My generator dealer sent me another new part from his stock. Arrived today.....tested with the chinese connector...the plug fits perfectly, engages, clicks at its final position...
And now?! Does anybody want to change my generator for....maybe a good glas of wine.... ?
I love it....especially doing things twice.....
So I hope somebody could provide the information if this fat red cable from the generator output will go straight to the megafuse in the trunk. So if I disconnect that cable in the trunk, I won't have to disconnect the batteries.

Dirk

Been following this Dirk, what a job you have had!
The plug on mine worked fine and now your replacement is fine.
The supplier in china obviously needs to sort their quality control out.....
Maybe ask your local supplier guy for 5 hours of your labor to correct the problem, tell them that this story has gone global and many people are watching how this one ends...
Worth a try?

Well done for sticking with it, its not been easy.......

Al