Unveiling Battery Secrets Interpreting Tester Fluctuations Mid-Drive

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. New cars can have an active battery/alternator management system and this behavior as you describe can be completely normal. 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 ... Need Help? Ask a mechanic online, 24 hours a day here: https://tinyurl.com/24-7-mechanic In this video we'll talk about different reasons ... 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 ... I installed a AGM battery and with a volt meter I am reading 14.9-15.3 volts at the battery with it running in park. The needle on the dash ... 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 ... 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 ... This depends on RPM, speed, temperature, electrical load, and other things. It could be changes in outdoor temperature, A/C usage, or any number ... It's completely normal for voltage to fluctuate based on engine load. If the car needs more power (such as during acceleration), it may dial back the charging ...