![]() ![]() Now, picture a battery that is already not well charged powering the parasitic car components that must remain running when the car is off. This, therefore, means that your car battery is not charging properly as it should, and its output is below the expected 13.5 to 14.5 volts. When your charging system is not charging your battery as it should, the consequences are a drained battery when the car is off or even worse your car battery draining while you are driving to the point that the battery dies suddenly.Īn ineffective charging system can result from either loose connections or corroded tensioners. And this is how your car battery ends up getting drained when the car is off. However, when your car battery has electrical problems, these normal parasitic drains can be extended to other car components that normally remain off, such as turning the glove box lights on. These components include your security alarm, radio presets, and clock. The normal parasitic drains refer to the energy supplied by your car battery to certain components in your car to keep them running even after you turn off your car. These electrical glitches can result in the normal and expected parasitic drains on your car battery becoming excessive and drain the battery when the car is off. This, in turn, will drain your car battery and cause the car not to start.Įlectrical glitches in your car and car battery may be caused by factors such as poor installation, faulty fuses, and flawed wiring. A corroded or defective alternator diode will faultily continue charging the circuit even when the car off. The alternator is responsible for recharging the car battery and powering electrical systems of the car such as the radio, lights, ignition, etc. If your battery is not old, but it still drains when the car is off, you should inspect the state of your alternator. A yellow eye is an indication for a battery that needs replacement. Pro tip:If you have, a free maintenance battery, then the charge indicator should confirm to you whether you need to replace the battery or not. Replacing it should resolve the car battery draining issue. Therefore, your constant car battery drains may be a tell-tale sign that your battery has reached its maximum years of service. A poorly maintained one, however, may need replacing in as little as 3 years of usage. Typically, you should replace your car battery between every 3 to 5 years of usage.Ī well maintained and high-quality battery can effectively serve your car for up to a maximum of 5 or slightly more years. It can no longer hold a full charge like it used to. How long ago was it when you last replaced your car battery? If you have been using it for over four years, then the most probable cause of your car battery draining when the car is off is old age. ![]() How then can your fully charged battery drain while the car is off such that it can’t start your car? Below are seven reasons that might be the cause of your current car battery frustrations: Therefore, when you park and turn off your car, your battery should be fully charged and ready to start your engine the next time. ![]() Ideally, what should happen is, when you start your car, the car battery should fire the engine to life.Īnd Once this happens, the alternator should then kick in and begin charging your battery to full charge while you drive. Well, you are right having a dead battery repeatedly is not normal. At least not as yet! But, if the battery has drained a couple of times while your car is off, then you must be sure that something is awfully wrong, right? It does not start! Well, like you, this is a pestering question amongst many motorists who’ve had to deal with this frustration at the least expected times.ĭon’t get me wrong if this is the first time your car battery has drained when the car is off, you might not need to fret as much. Have you ever wondered what can drain a car battery when the car is off? Or You car battery keeps dying overnight? Or You get ready to attend to your day’s activities, get into your car to drive off, but then the most frustrating thing happens. ![]()
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