Battery Diagnostics Demystified Understanding Voltage Fluctuations 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, ... 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, ... 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 ... (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 ... Observing the gauge while driving is not going to tell you the battery's voltage or charge level, it's telling you how many volts the alternator ... It's not likely that the efi would even run on 4 volts. Try turning on the headlights, watch the volt meter and light brightness at the same ... Well, I disconnected then reconnected the leads myself...then the truck started right up, but the battery gauge/meter started fluctuating. The ... ... battery and alternator, the two most common electrical problems in your car or truck! Check out this playlist for more DIY diagnostics tips ... Testing the battery, with the car on (headlights and heater on ... mine fluctuates, startup its around 12.8 for a while until i drive ... 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 ...