Battery Tester Enigma Deciphering Fluctuating Readings While Driving

(take it off the truck, your local auto parts store should be able to test it.) If the alt tests good, voltage regulator is bad, which, ... Sounds like a bad battery, but I would also check the output of the alternator to make sure it's up to par. You need to see at at least 13.5 ... Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. it is normal. THe computer controls the alternators output. (to save gas). THis is based on the batterys charge, temp, and vehicle electrical ... 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 ... 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 ... Short drives are normally a cause of battery/charging issues and so you are not fully charging the batteries. Hence the system charging voltage ... My latest issue is that every 2 or 3 days the battery guage will drop to 9V and she won't charge. The alternator tested good at the parts store. ... voltage fluctuates automotive voltage meter We hope this video was helpful! ... Car Battery Voltage Drops While Driving (5 Reasons Why). Vehicle ... The issue i'm having is that while driving i'll notice the battery voltage meter drop and the exterior lights will dim significantly.