Battery Health Detective Battery Tester Unveils Voltage Fluctuations

(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, ... For a new battery that voltage is a bad sign for the battery, like I said charge it and load test it. What brand ... It sounds like your system is operating correctly. You will see charging while driving until the battery is fully charged, then it will gradually taper down to ... The issue i'm having is that while driving i'll notice the battery voltage meter drop and the exterior lights will dim significantly. 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 ... It's caused by “clever” charging algorithms designed to save a few ml of fuel. This algorithm should only charge the battery once the battery ... ... and coming back on, no trouble codes and not all the time. I was in the power room today when it happened, the battery voltage drops ... 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. This depends on RPM, speed, temperature, electrical load, and other things. It could be changes in outdoor temperature, A/C usage, or any number ... 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.