What Should A Car Battery Voltage Be When Running. Its new battery is rated at 650 CCA and tested at 842 CCA with 382m ohms plate impedance. Why does my car battery voltage drop.
A good car battery should read 124-129 volts when the car is off. At what voltage should a car battery be replaced. The ideal car battery voltage with the engine running is between 137 and 147V.
Went out jumped it started up but notice that the headlights and dash lights were fluctuating at idle if I wrapped it up it did smooth out somewhat.
Connect the probes. The temperature outside affects the voltage of the battery. Then compare it to the voltage figures below. When your car is running the cars alternator is charging the battery this is why you should see a higher voltage.
