Battery Tester Malfunctions Why Does It Fluctuate On the Road?

This happens in a very slow manner, so I guess I wouldn't call it fluctuation but changing over time. During one driving cycle it may be between ... You check connection at battery? The alternator/ regulator and battery are a loop. Regulator reads battery and knows how much at test rpm of ... When the batteries need to be charged, the voltage goes up to 14.4v or so, and when it senses they are charged it drops way down, I've seen 12.9 ... 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 ... Your batteries are likely fully charged, or hot, and your engine needed to have less load on it so the alternator was cut back and the voltage ... Some of the battery voltage fluctuation might be normal. Check your owners manual about the special feature your truck has that was designed to increase ... It might be a good idea to take an actual voltmeter and test your battery's resting voltage. If it's 12.3 then it's chronically undercharged, ... 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 ... ... Check it out and learn how to diagnose an alternator! For More Info visit us at http://1aau.to/h/b8D/ ⚠ DISCLAIMER: While 1A Auto strives ... Noticed today my volts are fluctuating while RPM's are near or above 2000 on highway trip. At stop light had battery light come on.