It sounds like a parastic draw. Meaning there is a "parasite" or somthing that is taking elctricity when it shouldn't, away from the battery. Like a dome light or a circuit that is normally shut down when the car is off, but the circuit still draw energy.
For me, it was the boot light not shutting off and that drained the power out of the battery overnight. I am fortunate that I can fold down my back seat to check this, not sure how to check in a normal sedan though.
If you cannot find the source of the drain yourself I guess a trip the autoelectrician is in order?
Good luck. JO
This can be pretty easily tracked down. Disconnnect your negative cable from the battery, place a test light or multimeter between them & check for amperage. Start pulling fuses & putting them back in, as soon as the light goes out or the amperage drops you have found your bad circuit, you can then find the exact source from there. Also try pulling bulbs and harness connectors if none of the fuses makes the light go out.
If the car is on (Ignition is on, engine is running) then no. Nothing should drain the battery when the car is running, there is a device called an alternator with a belt that usually goes around the crankshaft that transforms the mechanical energy into electrical energy. As long as you have the car running, the battery should not die. If so, you have a mechanical problem.
An alternator is the part of an automobile that generates the power to run the radio, headlights, speakers, and air conditioning as well as any other electronic component in the car while the engine is running. This is different from when the engine is not running. When the engine is not running, the 12 Volt car battery operates these electronics. Unfortunately, every battery will die eventually, so the alternator also recharges the battery while the engine is running. This is a slow process, though. But unless the battery is charged, the engine usually can't ever be started.
If the battery dies with the car running usually the alternator will be able to keep up, but the malfunction indicator will light up. Some models will say something like check gauges. You alternator or voltmeter will go real high. If the car is completely dying then the alternator is failing or you have bad or loose battery connections.
Symptoms: Besides having a dead battery.......... If you charge or jumpstart your vehice's battery and successfully get it running to only have it mysteriously die and have no lights, radio, etc.; it is probably you alternator. If your vehicle will run constantly on it's own, but will not start after shutting it off, it could be your battery. If your battery will hold a charge on it's own, but goes dead a while after you start and run your vehicle, it is probably your alternator. Or, if you can get it running, it should have an alternator light that will come on when there is a problem. I would almost bet your car has one... my 1970 ford does.
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