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It is probably a bad diode in the alternator. I just went through this with mine.
I the battery runs down overnight then the battery may have a dead cell. It may also be something is on drawing power from the battery. Something like interior, under-hood, trunk, glove box lights. Can also be a stuck relay.
What else can I help you with?
Where is drain plug for the radiator of a 1992 Buick Regal Custom?
where is the drain plug for the radiator on a 1992 buick regal custom
What causes a battery to drain in a 1984 Buick regal?
Dead cell in battery, a light is on somewhere on the vehicle, or a relay is stuck.
Why Battery will not stay charged alternator and battery are good?
something is causing a drain on the battery when switch is turned off
Where is the oil drain plug located on a 1992 Buick Regal Custom 3.8 liter engine?
on the oil pan
How do you determine if the instrument cluster is causing a drain on the battery in a 1987 corvette?
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Why does my 1992 Buick Road Master battery go dead after sitting for a couple days?
Bad battery or drain in the electrical system
What is causing a battery drain with the key in the on position and no accessories on?
The key being in the "on" position itself. As for rapid battery drain, you could have a bad battery or there could be a loose connector. Source: Personal experience
Is your alarm causing your battery to go dead if it keeps going off?
Yes, that would definitely drain the battery.
Where do you drain the coolant for a 1997 Buick LeSabre Limited?
I'm not sure about the limited but on my custom the drain is on the bottom right of the radiator when you're facing the car from the front. There's a twist valve on it.
Would a bad solenoid discharge the battery?
If the defect is causing a parasitic drain, yes.
Why are new batteries drain on 1994 buick park ave while car is off?
Dead cell in the battery or some light is on pulling power from the battery. A stuck relay can also run the battery down.
Where is the 2005 Buick lacrosse radiator drain plug?
Is there a drain plug on a 2005 Buick century
