With engine off, key off touch the blade of a screwdriver to the end of the alternator shaft where the pulley is attached, if it grabs the screwdriver firmly you know the alternator is still energized.
Yes this can be an intermittent problem which makes diagnosing very difficult when it only does it once a week.
While not terribly common, seemed I have seen it more on Ford products.
There are countless things that can drain a battery overnight with many being vehicle specific so other than the obvious generic things like glove box or vanity light not shutting off or any recent additions to the vehicle ( stereo, command start etc) more info about the vehicles would be the place to start if you want helpful answers.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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