Battery Tester Insights Unraveling Fluctuating Readings While Driving

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. Short drives are normally a cause of battery/charging issues and so you are not fully charging the batteries. Hence the system charging voltage ... You check connection at battery? The alternator/ regulator and battery are a loop. Regulator reads battery and knows how much at test rpm of ... As the battery charge is used up the internal resistance does increase (as you mentioned). The result is when you hook the battery into a ... When the temperature is warm enough, and after you've driven for about 25 minutes or more, then it reduces the charging voltage from around 14 ... Remove the ECU 32 pin wiring harness connectors and inspect the clips and pins for oxidation. The ECU controls the alternator charging rate of ... Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. Observing the gauge while driving is not going to tell you the battery's voltage or charge level, it's telling you how many volts the alternator ... If your aftermarket battery bolt is too long (the end screwed to the battery), it may pull the lead plate with the female threads out from the ... 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 ...