Electrical System Insights Battery Tester's Role in Voltage Fluctuation Detection

Voltage varies depending on battery conditions, and which electrical loads are switched on. All the voltages you listed are in the normal range. After 10 minutes or so of driving, the voltage of the battery will drop and hover in the range of 12.2-12.5. There are 2 ways is raises back up. (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, ... 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 ... Remove the ECU 32 pin wiring harness connectors and inspect the clips and pins for oxidation. The ECU controls the alternator charging rate of ... It's normal. Modern cars will fluctuate voltage depending on load and battery charge state. Hope you got the answers you were looking for, but ... Testing the battery, with the car on (headlights and heater on ... mine fluctuates, startup its around 12.8 for a while until i drive ... Seems to be a normal variance between charging/not charging once a battery is essentially full. Your fairly lengthy trip probably gave your ... There is always the possibility that the battery is simply at its end of its useful life. Voltage readings of the battery and during charging ... It sounds like the voltage regulator inside the alternator is bad. Just an FYI most all auto parts stores will test your alternator, battery, ...