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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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