Battery Diagnostics Demystified Interpreting Fluctuating Tester Readings While Driving

(A) Ensure you have a good solid ground strap from the Battery to the Engine and 2 A solid strap from the Battery to the Chassis, (B) Also check ... I was driving the other day and the check gauge light came on. My ... while, then voltage drops again, shut off engine, restart, etc. They will intentionally let the battery charge drop while driving - battery voltage will drop to around 12.6v or so when this is occurring. ... battery and alternator, the two most common electrical problems in your car or truck! Check out this playlist for more DIY diagnostics tips ... New cars can have an active battery/alternator management system and this behavior as you describe can be completely normal. 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 ... Depending on the RPMs and electrical load it will fluctuate up and down. It should be in the 12-14v range most of the time though. Its only ... It is highly likely that the alternator and/or voltage regulator are the problem. '04 330i ZHP - OEM Clears - ///M Strut bar - CoolantSnitch. Reason is, your charger might see it as a short (very high amperage load at the onset). Also, check terminal connections for corrosion or lose ... So, it kinda sounds like your battery is not being charged during acceleration. Or else, something is drawing more current (dropping the voltage) ...