![]() Open the car battery hood and observe the condition around the battery. Corrosion damages the battery and prevents the battery from producing the maximum amount of power to the car, which eventually makes the voltage gauge drops while driving. We are familiar with corrosion, especially when it’s about batteries. After you check all the connections and see loose connections are the main culprit to battery gauge drops while driving, you have to replace and reconnect all loose wires. You should also check for any flux or corrosion around the connections. In your car user manual, you will see car manufacturers always tell you to check connections are tight and properly connected. 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. 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.
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