The Battery Tester's Tale Unmasking Voltage Variations While Driving

Believe it or not, the battery acts as a capacitor when the car is in use, to keep the voltage level stable. If you see the voltage going up as ... ... 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 ... So, it kinda sounds like your battery is not being charged during acceleration. Or else, something is drawing more current (dropping the voltage) ... If your aftermarket battery bolt is too long (the end screwed to the battery), it may pull the lead plate with the female threads out from the ... If not enough current is supplied the voltage drops. Also, low idle RPMs and high load (heaters on, headlights on, and... you get it) might be ... 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 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 ... 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. drops to 12.5 while driving ... If it keeps up, then have a FLAPS load test the battery no alternator at RPM you are seeing the fluctuations. First, check the battery clamps themselves. Have they been over tightened over the years so they are distorted and cannot tightly grip the ...