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What can be draining your battery when the car isn't running?

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2010-02-19 20:01:17
2010-02-19 20:01:17

Putting the lights on, listening to the radio or anything else that is plugged into the car.

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Either a short to power or a bad fan switch.




Your battery is going bad and something may be draining the battery. If you have a weak battery, it will lose charge. The car charges your battery when you run it and if you dont run it, it will go dead. If your car dies while running, in that case you might need a new alternator.



Something is on draining your battery overnight. Any light or any relay. It can also be your battery has a dead cell draining it overnight.


While the car is running the alternator should be recharging the battery faster than stereo can drain it. I suspect you either have a problem with the alternator or its time to get your battery replaced. Until you get it fixed, if you don't turn on the radio, it wont drain your battery :) If it is a high power model, it needs to be wired directly to the battery.


A light in your car might be on, running down the battery!!


Can be any light in the car as in, under hood, trunk, glove box, etc. Can also be a relay that is stuck. Can also be the battery has a dead cell and is running itself down.


A battery is used to start a car. Once it is running, the alternator then supplies electrical energy to charge the battery as well as power the electrical systems in the car. Removing the battery while the car is running will not affect the running of the car.


you possibly have something draining the battery when the car is shut off, with the car shut off pull the positive cable off the battery and then just touch the cable to the positive post of the battery and see if you get a spark, if you get a spark you have something electrical draining the battery.


If the parking lights are on when the car is off its probably a switch issue.


many things can do it suck as junk battery, junk alternator , or leaving anything on in the car


If your battery is good and you know your car is draining it then yes, disconnecting your battery from your car will keep your battery charged for much longer than 3 days. Your battery should stay charged way longer than 3 days in normal conditions being hooked up to your car. You should get it checked out and figure out what is draining your battery so fast.


your alternator ain't charging your battery or a bad connection draining the battery


Could be the life of the battery has expired or the charging system is faulty or the vehicle has a draw on the system killing the battery when not running. Drive the vehicle to your local auto parts store. They will test the battery and the charging system at no cost. Battery is bad or something is draining it. Most places that sell batteries can check it. With it charged, disconnect it and see if it holds a charge. If it does, something in the car is draining it. Dead cell in the battery or something is on drawing power from the battery.


You should read from 13.5 to 14 volts at the battery when the car is running.


No, that will have no effect on the battery.


If the electic window motor in your car is draining your battery when the car is turned off, then you have more serious problems than figuring out how to disable it. I suggest you have your mechanic check the electrical system in your car. Most likely point of failure is in the switch.



Referring to a car battery, a current drain is the power draining out of the cell.


Check your earth (ground) connections battery to chassis & battery to engine / gearbox.


Dead battery, Alternator not charging, Ignition off draw draining battery,.............


No, this will place a very heavy load on the alternator of the car and may result in burning out the diodes of the car charging the battery. You could easily ruin the alternator. Purchase a battery charger and charge the dead battery with that. Alternators are not made to charge dead batteries.


On an automobile battery it sure does. Each time the battery is discharged the life is shortened. On a deed cell marine or golf cart battery this is not the case.



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