Try disconnecting the alternator to see if the drain goes away. If it does, the alternator has a bad diode or defective regulator. I would do that first, just to be sure before taking the alt back. How is the health of the battery? If it has a weak cell, it will discharge siting overnight.
Any accessory left on will do the same, so will corroded wires inside a harness or behind the fuse block connection. If you put an incandescent test light in series with a battery cable and the battery post, that will tell if there is a drain. A full bright light is a significant drain. A very dim light is normal for a one wire alt. Though it is a drain, it would take months to discharge a battery.
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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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