position of external alternator regulation device

Hi there,

I am new to this community and just recently bought a '73 365 GT 4 2+2, which in theory is great.

Practically the car seller in Italy (a company) changed between the testing of the car and the purchase the original alternator against a "new" one (as they said the old one did not work properly any more), however not original and after 800 km the v-belt failed. The new alternator turned out not only to be not original but also the V-belt pulley was of a completely different size, thus the v-belts just have to fail continously.

In the meantime I got hold of the original alternator, had it fixed and put it back into place.

now the problem is the following:
the old alternator has an EXTERNAL device regulating (proper english term unknown) the electricity generated and normally protecting the battery from overrun or whatever, however in new alternators this is built in the alternator itself.

Building in the old alternator I could not find the external regulator device nor the cables fitting the alternator (should be 5 in total, found only 2). So the alternator is connected but simply does not work.

Does anyone know where the external regulator device (sort of several diodes) is located and does anyone have a clue where the cables should come from as my fear is that the car seller's mechanics just cut everything and threw it away and as I have no knowledge about it I cannot even see, whether something is missing or was never there. A technical picture would be great!

It would be great help as I fear that putting the car in a garage would be not only an expensive but also risky exercise, as I guess that the result out of a garage rarely helps with old cars, but is normally just done in a way which after 2 month results in more problems elsewhere - so i try to do it myself.

Thanks and hope someone out there hears my crying...

the addicted