Battery Tester's Fluctuating Footnotes Interpreting Signals While Driving

If not enough current is supplied the voltage drops. Also, low idle RPMs and high load (heaters on, headlights on, and... you get it) might be ... While I am driving, I see that my battery voltage goes from 13.6-14.0 to 12.2-12.6 volts and it keeps on fluctuating like this every 30 seconds or so. Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. Believe it or not, the battery acts as a capacitor when the car is in use, to keep the voltage level stable. If you see the voltage going up as ... I think that's normal. Instead of holding a fixed voltage the BMS drops the voltage during low demand. I suspect it's one of those tricks to ... Either you got a faulty alternator or there's a problem in the wiring between the alternator and the battery. Look for corroded/loose battery ... 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 ... Well, I disconnected then reconnected the leads myself...then the truck started right up, but the battery gauge/meter started fluctuating. The ... It's normal. Modern cars will fluctuate voltage depending on load and battery charge state. Hope you got the answers you were looking for, but ... Driving vibration may shake up battery and increase charge as gas bubbles get shaken out driving. Since you park with a maintainer plugged in I ...