What Should A Car Battery Read When Running. Start with a fully charged battery. When the engine is running this measurement should be 137 to 147 volts.
A fully charged battery should read about 125 volts when the key is in the ignition and turned partially but the cars engine is not running. A good healthy car battery should register about 126 volts. There is a very big difference when a car battery drops even a small amount of voltage.
When a car drops for instance from 126 to 120 there will be 75 difference.
Car battery voltage. Your car batterys purpose is to provide the initial power required to start your cars engine. If you dont have a multimeter to tell you the voltage of your battery you can do a test of your electrical system by starting the car and turning on the headlights. Use our Find a Retailer for a location near you to get a free battery test.
