Battery Tester Revelations Analyzing Fluctuating Readings While Driving

Some home testing: disconnect your extras, recharge the battery and see if you still have the issue. You can get a charger that will show the ... 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. This is completely normal with modern charging systems from GM and other manufacturers. Output voltage is computer controlled to provide only what is necessary ... 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. Either you got a faulty alternator or there's a problem in the wiring between the alternator and the battery. Look for corroded/loose battery ... 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 ... 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 ... It still kinda sounds like the alt isn't doing anything and the battery is running the car. Vice versa, if the battery is bad voltage will ... (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 replaced the original battery this past January and had no issue until this past weekend in the middle of a 900-mile road trip. While cruising ...