What Voltage Is Too High For Car Battery. And the voltage indicator drew my attention almost immediately because it would be all over the place the highest I saw it was 142V which AFAIK is too high but then I also saw it read 128V which is too low for charging. Therefore a voltage appears that is higher than usual.
The same is true when measuring battery voltage to determine if a battery has gone bad. 123v is the voltage of the battery that alternator isnt getting ANYTHING to the battery if thats what its showing while the car is running. A fully charged car battery voltage should be 126v or above this is with the engine off.
When you diagnose an overcharging battery you need to always take a close look at the alternator because the alternator may be sending too much voltage to the battery.
Each battery has six cells each with 21 volts at full charge. Is car battery jumper the same as car battery charger Automotive 20 replies Dead battery or murdered battery Automotive 17 replies 2001 saturn not fully cranking Retired Brands 2 replies 99 Corolla battery voltage is 146V with the engine idling. 148V is considered overcharging. A fully charged car battery voltage should be 126v or above this is with the engine off.
