Battery Tester's Fickle Fluctuations Identifying Causes While Driving

The voltage regulator shuts down the alternator as the battery reaches its charge and the gauge gradually drops to battery voltage. When there's ... This sounds like one or more cells in the battery are going South. You need to use LeafSpy Pro to get a depiction of the battery cells and the voltage ... Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. You'd have to test the battery monitoring sensor and the battery itself to see if there is actually an issue or not. BUT I can say that the ... It sounds like your system is operating correctly. You will see charging while driving until the battery is fully charged, then it will gradually taper down to ... This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent ... Especially around here in the cold, they can die without much warning. If the cables are crapped up, you can try cleaning all the terminals and ... New cars can have an active battery/alternator management system and this behavior as you describe can be completely normal. Your batteries are likely fully charged, or hot, and your engine needed to have less load on it so the alternator was cut back and the voltage ... The slower the engine is running and the higher the electrical load is it will cause voltage to drop slightly but if you increase engine RPM the ...