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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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