A good connection of the alternator is essential. Contacts and terminals should be ok, cable cross-section big enough. The Lucas ACR alternator has a black 3pin cap. Mine has lost it's cover since long, the brown cable got stiff over the years and I wanted to improve the whole charging circuit. The diagram shows the original cabling with two 2.5sq/mm to connect to the battery and starter. I opted for a 6.0sq/mm section which gives a little more cross-section and only one cable to install. I soldered it to the brown cables very near to the connector.
The case is ground and connects the negative to the battery and starter via the chassis. The positive spades are 9.5mm (ref. T407) for the charge current and 6.3mm (ref. T406) for the warning light on the dashboard. Click the terminals' pic to get to a complete guide of all the automotive terminals and connectors.
Cheers.
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