Your car’s battery is responsible for starting the engine and powering up its electrical and electronic components like the radio, tail lights, headlights, dome lights and others. That’s why if these things are left running without the engine on, it can deplete the battery’s charge rendering it useless.
So why is it important to leave the engine running when there are electronic components turned on? That’s because there’s a part in your car that charges back the battery using the engine. It’s called the alternator and without it, you will often need to buy new car batteries and that would be impractical.
But like other things with moving parts, the alternator is also subject to wear and tear. One of the most common problem in an alternator is a noisy bearing. When it happens, you don’t really need to replace the whole alternator. You just need to replace the bearing balls. This video will show you how.
Image source: michaelovitch
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