⚡ Do you want to be a successful electrician? Check out my complete training. Click here ???????? https://www.eunaupmotors.com.br/eletr... --------------------------------------------------------------------------------------- The car battery has a useful life just like all other battery models of other equipment and in the same way we do not have an indicator telling us how much longer the battery has left, which makes it difficult to know when it will fail and no longer be able to store charge to start the car's engine. That's why it is necessary to do a manual test to know if the car battery will still work for some time. It is very unpleasant to make a wrong diagnosis on the battery because it is frustrating to have a problem with the car, spend money to fix it and then find out that the expense was in vain because in fact it was not exactly what was faulty. This happens every day with drivers who had their battery replaced due to a wrong diagnosis. Let's learn together today how to make this diagnosis using one of the cheapest multimeters. First, we must set the multimeter correctly to the 20Vdc scale and place the black probe in the COM hole and the red probe in the hole marked V. After that, we go to the battery and perform the tests by connecting the test leads to the positive and negative poles. With the multimeter set up and installed on the car battery, we must evaluate the voltage found with the car off. This voltage must be greater than 12.20V. If it is lower than this, then the battery does not have the adequate charge for the next start of the car. The second evaluation is the voltage drop at the time of starting. This voltage must not be lower than 10.00V. Any value below this means that there is a very high drop and the battery is no longer able to support the energy needed for the starter motor to start the car's engine. Even if the battery failed these two tests, it does not mean that it is bad, because there is still the possibility that the battery is not receiving enough charge to recharge sufficiently. To find out if this is the case, then we must test the car's alternator. To do this, we must use a multimeter to check the voltage found with the engine running, which should be between 13.50V and 14.50V with the engine running and the power supplies connected, such as headlights, auxiliary lights, air conditioning, and defroster. If the voltage remains within the ideal parameters even with the power supplies connected, then the alternator is working properly and we can assume that the problem is with the battery. However, if the voltage drops significantly when the power supplies are connected, then the alternator must be removed to check its internal parts, as one of them is defective. Thank you for following me this far, and I look forward to seeing you on our next topic. Thanks. Complete courses, all in one place! I teach you using the best current techniques, with my method that has already been tested and approved by more than 2,600 students in Brazil and other countries. The most complete course in Brazil, without any fuss. I know what works in practice in a workshop and I will teach you in a simple and online way, from basic to advanced. You will learn, even if you have no knowledge, until you perform the services just like the best professionals you know. ⚡ Successful Electrician. Click here ???????? https://www.eunaupmotors.com.br/eletr... ???? Car Sound System Installer. Click here ????????https://www.eunaupmotors.com.br/insta... ---------------------- ▶ SUBSCRIBE TO THE CHANNEL / upmotorscentrodeforma%c3%a7%c3%a3oautomotiva ---------------------- ???? FOLLOW ME ↴ ▶ Facebook: / eunaupmotors ▶ Instagram: / eunaupmotors ▶ Telegram: https://t.me/Eletricista_UpMotors ▶ Website: https://www.eunaupmotors.com.br/