What Should Car Battery Voltage Be Running. If the battery isnt fully charged it will diminish to 124V at 75 12V when its only operating at 25 and down to 119V when its completely discharged. Many systems have a running target voltage in the lower 14 volt range.
The ideal car battery voltage with the engine running is between 137 and 147V. If so could be a bad voltage regulator--if so may be overcharging battery Check voltage readings at battery should be around 142 with car running -- if much higher than this voltage regulator is. When You Start Your Car.
I do not have easy access to measure the voltage directly coming out of the alternator.
In fact a batterys voltage should register nearer to the higher range if its working properly but different numbers may be recorded under varying conditions. The ideal car battery voltage with the engine running is between 137 and 147v. If the battery isnt fully charged it will diminish to 124V at 75 12V when its only operating at 25 and down to 119V when its completely discharged. When your car is running your battery should register between 137 and 147 volts.
