Are my locks causing my battery to over night?

new battery still charge every two weeks now, i's dead every night

My car has 114000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
This may be a sign of a failing voltage regulator or a failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often, this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely destroying the battery.

In other cases, it may mean the alternator is not supplying enough power to the battery, undercharging the battery or not charging it at all. In either case, I would recommend having an expert, such as one from YourMechanic, come to your location to diagnose your vehicle’s charging system and see if there is some sort of other electrical problem within the car that is causing the dead battery.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :


Every time you open the doors or trunk to get something out, your car springs into life and the interior and door lights will drain the battery. As an example, unlocking your vehicle, popping the trunk and locking it again can draw around 50A from the battery.

What may drain a car battery when it`s off are things such as interior lights, door lights, or even bad relays. While your engine runs, the alternator recharges the battery — which is why you typically don`t have to worry about the battery dying while you`re blasting the radio on your drive to work!
One of the major culprits is it`s simply an old battery. The average lifespan of a car battery is only four to six years, so if you`re in that range or over, it`s probably time for a new battery.
Shut your car properly

Before getting out of your car, check that the interior and headlights are off and all accessories like the phone charger socket and USB ports are switched off. Using the radio or GPS once the engine is off will drain your car`s battery too, so make sure you turn them off.

Using a test switch and digital ammeter is the simplest, most accurate way to measure parasitic drain directly. A test switch goes between the negative battery terminal and negative battery cable.
When the alternator fails, other systems that are connected to it may also start to malfunction. These include things like power windows, locks, lights, air conditioning, and even your radio. Other factors might be at play, but it`s worth getting your alternator checked by a reliable auto mechanic.
If your phone`s battery is draining faster than usual, it either means you`re using a lot of energy or your phone is not using energy efficiently. This could mean you`re overworking your phone by running too many applications, or something is physically wrong with the phone battery itself.
The ignition relay is essentially an electrical device that works as a switch for the power to the ignition system. Its job is to make sure electricity flows from the battery to the different components that need power. A bad relay will drain your battery and make it difficult to start the ignition.
The majority of cars now have remote central locking, however, with a flat or dead battery this won`t work and you will be forced to use the key to open the car doors. This doesn`t necessarily mean that you need a new car battery.
The short answer is: Yes, it can. It could also drain the battery even faster if you repeatedly try to start your car with a faulty starter. A faulty starter is also one of the leading causes of battery overcharging.
A corroded or defective alternator diode will faultily continue charging the circuit even when the car off. This, in turn, will drain your car battery and cause the car not to start.
One of the most common causes of an alternator`s demise is the bearings fail and seize up. That can happen from dirt and liquid getting into the bearings combined with the heat of the engine. You might hear a grinding sound, an early warning that something`s wrong.
It was thus found that the dark mode can significantly save battery life in peak brightness, usually employed by smartphone users in outdoor conditions under sunlight.
Use airplane mode or low-power mode (if you must)

Indeed, in our testing on Android and iPhone smartphones, enabling airplane mode resulted in the battery level dropping by just a few percent over four hours during normal use (or as normal as use can be when the device is in airplane mode, as we note below).

Contrary to its purpose, an alternator can drain a battery. It`s rare, but it`s possible. A draw on the battery only occurs if there`s a problem with either a component in the alternator itself or connections to it.

Leaving your car key in your car overnight or even on a hook near the car is not recommended. If the fob is too close to your car, it can continue to communicate with it, which could drain the battery.

Such a technology is known as morphogenesis, GE says. One of the two grants that GE and its partners were awarded is for the creation of what GE calls the IMMORTAL battery that stands for InterMetallic MORphogen Tailored Activity Lithium. That`s the battery that will last virtually forever.
Leaving a car door unlocked may stop a side window from being broken, but this is more likely to occur if valuables are left on display in the car. A better solution is to ensure that all valuables are removed from a car when it is parked.” Appel also comes down on the side of locking it up.
Leaving a car door unlocked may stop a side window from being broken, but this is more likely to occur if valuables are left on display in the car. A better solution is to ensure that all valuables are removed from a car when it is parked.” Appel also comes down on the side of locking it up.
With car running, lock all the doors from the inside. Exit the driver`s side door with the doorhandle (which unlocks your door), close door, lock door with mechanical key. The door will only unlock with the mechanical key, but there you go.
Car or truck doors may automatically lock once you`re driving. But locking up as soon as you get in the driver`s seat better protects you from surprise break-ins.
Electrical devices or lights left running, a defective charging system or alternator, and extreme weather are some common reasons but maybe it`s just time to get a new battery.”
Car or truck doors may automatically lock once you`re driving. But locking up as soon as you get in the driver`s seat better protects you from surprise break-ins.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Front Passenger Lock sometimes does not lock with a remote control or by locking button located on either doors.
ANSWER : The solenoid is on the door latch and is most likely the cause of the problem for your 2005 Toyota Tacoma. If you want to have this inspected and repaired, a certified technician from YourMechanic can come to your home or office to diagnose your door lock and perform the correct replacement.

Corsa b locking problem when I lock all the locks don’t lock but start making a noise as if they were trying to
ANSWER : Hello, thank you for writing in. These types of symptoms can be traced back to several different components. The first thing to find out is if all of the doors are having this issue, or if it is just one of them. Test the inside lock button and see if they successfully lock and unlock the doors. If the key fob and the inside controls both do not work, for any of the doors, then you have a module problem. If the driver’s door is the only door effected, you will want to look at the mechanics, as it is likely the linkage or wiring that has failed. For more help and further inspection, contact our service department to schedule an appointment.

all doors lock only by inserting key in passenger side door and locking
ANSWER : Your central locking system may have been designed with a control module in the circuit. This is a small computer that is responsible for controlling the different functions of a particular system. It is possible that the module for your central locking system may have shorted out internally preventing particular functions from working properly. I would recommend having a certified technician test your central locking module to determine if all of its functions are working properly.

Driver and Passenger doors won’t lock, but I hear them click and see the locks twitch.
ANSWER : If the same problem is happening even when you use the inside door lock switch then the most likely cause of the locks not moving is going to be weak actuators. You should replace the drivers lock actuator first since it is used the most and you will see it fixes the problem. Then you can replace the other doors as needed.

Automatic locks do not work properly.
ANSWER : Hi there. When the locks look as if they are trying to move but do not, it’s typically due to a fault with the primary module or relay that powers the door locks. There are many different components that make up the power lock system, so before you attempt to remove or replace the module, you might want to have a professional mobile mechanic complete a power door locks are not working inspection.

Battery light stays on and overnight battery drain. 2006 Land Rover LR3
ANSWER : Hello – this problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and identify, replace or repair the failing component.

Battery keeps getting drained while the car is off during the night
ANSWER : Hello there, thanks for writing in about your 2009 Chevrolet Aveo5. Batteries that drain overnight are not uncommon. This is called a parasitic drain and can have many different causes. The most likely are any aftermarket electrical accessories, such as the radio, a power seat, window switch, dome light or wiring fault. I recommend having a certified technician look over the vehicle’s electrical system in order to diagnose why the battery keeps draining and make the necessary repairs.

When changing the car battery, do you "register" the battery to the car computer?
ANSWER : Hi there. Changing the battery has nothing to do with programming a battery. If the car was flat dead with a battery that lost all of the power because the dome light was on, then when jumped the vehicle will run fine. What may need programmed when the battery is replaced is the key fob. The key fob will lose programming to the computer as the vehicle computer is reset. However, if a 9 volt battery saver was put into a cigarette lighter and the car battery was removed, then the computer will not lose its memory and be just fine. If you need further assistance with your battery, then seek out a professional, such as one from Your Mechanic, to help you.