To save long description I'm borrowing the following wiring diagrams from the Land Rover Series 2 club. First is the petrol version with negative earth which shows the dynamo wiring with external regulator. Yours should be similar assuming same battery polarity, wiring colour codes as well maybe, being generic.
![[Linked Image]](https://www.series2club.co.uk/gallery/technical/gifs/2A_1969_petrol_master.gif)
Below is same after alternator conversion. Note the dynamo regulator can be retained for originality and used as a junction point providing A1 and A terminals are joined at the back since this legacy control is not needed with alternator. This can save on need for fresh wiring.
![[Linked Image]](https://www.series2club.co.uk/gallery/technical/gifs/2A_1969_petrol_alternator.gif)