Yes I think it has the stop/start shunt so if it is the smart alt. I'll have to do some more checks to see why I don't see the voltage changing.C of C is Certificate of Conformity every new vehicle has to have one. You should have one from Fiat, another from Autorail and if it has an Al-Ko chassis one from Al-Ko. You can't register a vehicle without the final C of C.
The B"B could be anywhere between the starter & Hab battery.a 20 amp one would be quite small.
As it's Euro6D I would think it would have a Smart alternator, if the Starter battery negative terminal has a shunt connected to it it will have a Smart alternator.