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 - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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