Battery Voltage Enigmas Unraveling Fluctuations with Precision

Testing the battery, with the car on (headlights and heater on ... mine fluctuates, startup its around 12.8 for a while until i drive ... If the truck was saying 14+ while driving the entire time, there is probably something wrong as the "smart" charging system should only charge ... My latest issue is that every 2 or 3 days the battery guage will drop to 9V and she won't charge. The alternator tested good at the parts store. This is completely normal with modern charging systems from GM and other manufacturers. Output voltage is computer controlled to provide only what is necessary ... The voltage at the battery should not drop below 12 volts engine off for a healthy battery, and not go above 14.5 when running. You may have a battery or ... I replaced the original battery this past January and had no issue until this past weekend in the middle of a 900-mile road trip. While cruising ... The voltage regulator shuts down the alternator as the battery reaches its charge and the gauge gradually drops to battery voltage. When there's ... It's likely your charger. Sometimes they get a little loose in the socket and they might vibrate out, or the charger needs the contact points ... It still kinda sounds like the alt isn't doing anything and the battery is running the car. Vice versa, if the battery is bad voltage will ... Yes normal behaviour. In your case, something else is going on. Check your battery post for corrosion. 2023 ...