Both the Lucas, and Magnetti Morelli alternators have the same regulator pack inside them. One diode can fail, and while the alternator will still charge fine, with full output, the failed dioded allows current to flow backk to the alternator after shutdown.
About an hour after you shutdown, put your hand on the alternator. If it's warm, or, likely hot, that's likely your trouble. That's not to say it couldn't be something else, in which case, one by one pulling fuses, with your ammeter in line with the battery and positive cable will be the quickest way to isolate it.
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