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.

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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.

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Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone