Battery Tester's Voltage Variations Mastering Fluctuations On the Road

I'll have to stop by Autozone and have them do a test on the alternator, I installed a brand new interstate battery about 7ish months ago give ... Get the battery load tested. Only way to confirm battery is indeed good and not having a weak cell only holding a ''surface'' charge. Check the alternator belt: If the alternator belt is loose or worn, it can cause the battery gauge to drop as well. You can check the tension of ... It is highly likely that the alternator and/or voltage regulator are the problem. '04 330i ZHP - OEM Clears - ///M Strut bar - CoolantSnitch. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent ... They will intentionally let the battery charge drop while driving - battery voltage will drop to around 12.6v or so when this is occurring. I measured this voltage using a battery analyzer which shows live output as well as with a fluke meter. Additionally I pulled the live data with ... Does so at idle or while driving down the road. Tail lights ... I placed volt meter on the battery and showed him the voltage fluctuation. A good battery with engine off should read 12.5vdc. Your charging system (DIC) when running should read about 14.2vdc. 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 ...