Unveiling the Battery's Secrets Unraveling Fluctuating Readings

Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. Seems to be a normal variance between charging/not charging once a battery is essentially full. Your fairly lengthy trip probably gave your ... While the voltage gauge is at 0v, and the engine is still running, i pop the hood and put a battery/charging system tester on the battery ... When I start my car, my volt meter is showing a steady 13.8 volts. However, once the car heats up, or after 10 minutes driving, it drops to 11.9 ... 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 ... drops to 12.5 while driving ... If it keeps up, then have a FLAPS load test the battery no alternator at RPM you are seeing the fluctuations. Ford has a battery management controller in these vehicles these days, and because it is running an AGM battery rather than the traditional lead ... Ok, your voltages look great, so if the gauge is still fluctuating while you are reading those voltages, then it's most likely a cluster problem ... I don't drive it that often. Maybe it's normal and something to do with recharging the battery after extended idle periods. Has anyone else ... 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 ...