What mechanic said could be true, apart from the fact that I doubt that there was 120A alternators in B3 cars - IIRC on more luxurious C3 cars there was only optional 110A alternator, which I'm not sure if ever was fitted on B3 from factory, while 120A alternator came only with multi groove belt.
When I will have need to replace my battery, I will go for biggest possible to put in battery tray [which will be diesel battery of about 85 Ah capacity], currently I've installed 110A alternator but in the future I'll go for 120A alternator.
As for leak testing - most cheap-ass multimeters have only 200 mA max current, which is not enough, unless measurement is done with skill, as some devices might draw considerably more at the moment when power is restored. Some time ago I tried to measure power drain in such a way, which resulted in blown multimeter fuse. Next time I will use mechanical ampermetre, as it doesn't have any fuses, while it will be able to survive current spike. Otherwise I agree with John.
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