If the car will turn on, but it takes a few tries or starts on a delay, then the battery is probably fairly weak. If the vehicle won’t turn on, that’s usually a sign of a battery that is dead or dying. Sometimes those electrical components simply won’t work at all if the battery is fading.īut the most sure sign of a weak battery is trouble starting your car. You might notice some electrical issues with the car, such as headlights that are too dim, or flickering, or power windows that are moving more slowly than usual, or poor sound quality from the stereo. While you can use multimeters and voltmeters to determine the voltage in your car’s battery, your car will also usually give you a fair amount of warning signs when the voltage is beginning to dwindle, and the battery is starting to go. If the voltage reads below 12.6, you probably need to charge your battery. If the voltage is above 12.8, you should drain the battery a little bit by using the electrical components before turning it on. It should be sitting between 12.6 and 12.8, though it can be a little bit lower depending on the weather. Now you’ll want to turn the key of the car to the run position, and get a reading on the multimeter or voltmeter. Next, attach the positive lead of the multimeter or voltmeter to the positive lead of the battery, and then attach the negative lead of the multimeter or voltmeter to the negative lead of the battery. At this point, it’s a smart idea to check the battery’s terminal for corrosion and clean off any that you spot. Start by turning the car off, and removing the battery’s positive terminal cover. All you’ll need is a multimeter or a voltmeter, both of which are quite affordable. While you can always take your car to a mechanic (or an oil change spot) to have the voltage checked, it’s an easy task to do at home.
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