Car Battery Voltage When Off
Car Battery Voltage When Off . When the engine is running, this measurement should be 13.7 to 14.7 volts. The same is true when measuring battery voltage to determine if a battery has gone bad. When does a car battery need to be replaced? from www.testingautos.com Wait for the reading to set on 0.01 or 0.02. 1 month ago anderson connectors. At 25% charged, the voltage will measure around 12 volts.