It’s always recommended to check the alternator connections also. As you knew earlier, a bad alternator can be the reason why your battery gauge goes up and down. Loose connections also can affect the vehicle alternator.
Loose connection in car battery grounding is also a bad practice. Loose connections on the battery can’t maintain the right battery voltage, and when the battery can’t get proper voltage, it makes battery gauge drops while driving.
And losing connections in your car is the easiest thing to happen. Loose connections on batteries affect the vehicle flow of electricity.
Bad car battery indicator how to#
Related: How To Keep Car Battery From Dying 2. If you see that the voltmeter shows between 13.8 to the 15.3-volt range, this means your car alternator is in good shape.
Start the engine and recheck the voltmeter. Charge the battery if the voltage is low before conducting the alternator test in your car. If battery voltage shows less than 12.4 volts, this means your car battery needs a charge. The battery voltage should be between 12.5 to 12.8 volts. Check the car battery voltage with the engine off. To test an alternator, first, you need a voltmeter. You need to follow the instructions below step by step: The easiest way to test an alternator is using a voltmeter.īelow you will see how to test an alternator properly by using a voltmeter. The total replacement cost of an alternator belt is typically between $120 to $180.Īfter checking the alternator belt now, you should test the alternator. If you see your car’s alternator belt looks too old, with any visible damage, and too loose to spin, then you need to charge the alternator belt. When you check the alternator in your car, the first thing you need to check is the alternator belt (Serpentine belt). The alternator needs a belt (also called a serpentine belt). To tell what causes the battery gauge to drop while driving, you have to test and check your car alternator to see if it’s or not. So, if the alternator can’t provide enough power or charge, and that’s why the battery gauge goes up and down. An alternator can be the main reason why your car battery gauge fluctuates while driving.īad alternators can’t properly distribute the electrical energy in your car’s electronic system and into your battery. If you have a bad alternator or overcharged alternator in your car, many issues you might face. Vehicle alternators take the mechanical power from the engine and turn it into electrical energy to recharge the battery. 
Through an alternator, the car battery gets charged. A car alternator’s job is to charge the car battery and provide power to the electronic system in your car. The vehicle alternator is an electric generator.
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