You can't use up half now, and then wait and use half later. To clear up a misconception: a battery isn't like a water bottle. Almost everyday, we receive calls and comments about batteries that "won't hold a charge" any more. For the other cars, replace the cable to the terminal and the cover.Having battery troubles? Yeah, we hear you. Replace the Negative Battery CableĪfter you are sure that the parasitic draw has been resolved, you can replace the battery cable with the negative terminal.įor some cars, you have to use the wrench again to make it tight and not easily removable. I recommend doing another test to check if the drain test has worked and if everything is functioning well. In most cases, you can fix the problem by turning the component off or removing it from the system. You might want to refer to the manufacturer’s blueprints to know where each component belongs.Īfter isolating the issue, you can fix it yourself or if you are not sure, hire a mechanic to fix it for you. You can remove the individual components if it is an entire circuit while checking for the multimeter drop. If you remove a fuse or a circuit and discover that it is the one causing the problem, you can narrow down the problem and fix it. If it is the only component causing the drain, you can remove it and reconnect the battery. You will need to remove the fuse and replace it with another if you are confident it is causing the parasitic drain. The fuse that leads to a drop in the reading of the multimeter is the reason for the parasitic battery drain. Take note of any drop in the multimeter reading. This is done while still checking the readings of the multimeter. One of the most common methods for parasitic battery drain testing is removing all the fuses and replacing them one by one. If the multimeter records a reading of about 50mA, your car has a battery drain. The black probe will go onto the battery terminal. Then set the dial to read amps.Īfter setting the multimeter up, place the red probe through the metal part of the battery’s negative terminal. This is because a fully charged battery will read 12.6 volts. To get the right results, I recommend you get a multimeter that can record a reading of up to 20 amps. The red probe goes into the amps (A) input hole. To set the multimeter, you connect the black probe to the common labeled as (COM) input of the multimeter. Check the Draw Across the Negative Cable and Battery PostĪfter doing this, you connect the multimeter to the negative cable that you unscrewed. Sometimes, you might have to use a wrench to unscrew the cable. This is done to prevent shorting of the battery if you are doing the test from the positive end. You will need to remove the negative cable from the battery cable terminal. Some of these systems could cause the parasitic draw, and that is why you need to turn them off first. These include radio, and heat/ air conditioning. Turn off all electrical equipment that might be on. To begin this process, you must first shut down your engine and remove the key from the ignition. You will need to follow these simple steps correctly to avoid any mistakes that could prove costly. ( 1)īelow is a list of everything you’ll need to do a battery drain test. New car batteries can be bought from an auto parts store near you or an online trusted source. If your car does not easily start after turning the keys, then it means that your battery is weak and most likely needs to be replaced. This is the standard voltage for all batteries. New and fully charged car batteries should have 12.6 volts. How Many Volts Should a Car Battery Have? Luckily, battery drain is a problem that you can solve at home without incurring further costs. This is why your battery dies for good after some time, and the engine can’t start. This is because it causes a voltage drop with time. Parasitic battery drain reduces the lifespan of the battery. Since most cars today have many advanced auto parts and electrical equipment parts, a small parasitic drain is usually expected. Essentially, the car continues to draw power from the battery terminals even when the engine is turned off.
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