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If you're absolutely certain that the battery is ok (have it tested) and that nothing is being left on and that the key is turning off properly, it's time to have the alternator tested. Sometimes an internal diode can fail which will end up draining the battery. But don't just replace the alternator. Take the vehicle to your local auto parts retailer and have them test it for you IN CIRCUIT! Meaning that they'll test it with the vehicle running. They should be able to determine if the alternator diode has shorted.
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What would drain a car battery overnight?
lights being on all night....radio...electronic matters such as so...
Would a bad ignition switch cause battery to drain overnight and smoke out of steering column?
Good possibility
What would drain battery if not being driven?
There's something left in the car that use power even when the engine is off. Can be a dashboard clock, can be the vehicle alarm system, can be the stereo. The battery can also have a dead cell which will drain it overnight.
Why would an a New ReManufacturered Alternator Drain New Car Battery?
It won't. Look for a light that is on or a stuck relay. Also a dead cell in the battery will cause it to run down overnight.
Can electric seat belt drain car battery?
Yes, if the relay was stuck it would drain the battery.
Why would the negative ground drain the battery when car is off?
Because if you reversed the polarity at the battery it would blow the fuse through which current flows to the drain.
What would cause e battery drain on a 1978 corvette when you first start the car after letting it sit overnight and then once the car starts there is no further trouble throughout the day?
Either the battery has a dead cell which is draining it or, something is on which s drawing power.
Why would battery drain after motorcycle is started?
Its not charging.
What causes a car battery to drain on a mercury sable?
A car battery in any car would drain due to a short in the electrical system.
Are there any common known components that typically go bad on the 1998 Oldsmobile LSS in which would cause a drain on the battery overnight?
If you're sure the battery is ok (sometimes they can short out and draw down the charge) you might want to test the alternator to see if it has bad diodes.
Battery drainage on 1997 Chrysler town and country and is not alternator could it be that the radiator needs flushing which it does but would it cause battery to drain?
A raidator in need of a flush will not cause a battery drain.
Why would a new battery drain when nothing appears to be left on and the alternator checks out ok?
For a battery to "Drain" you MUST have a short somewhere or the "Glovebox" or "Trunk" light is staying on etc. etc. Battery's don't just "Drain" on there own ;-) TommyTrouble
