What Is A Good Alternator Charging Voltage. All too often the alternator is condemned as the source of the problem if only battery voltage is present with the engine running. Alternator Charging Voltage.
The other car I have which had a new alternator put in about 30000miles ago showed 142V - 144V when its engine was running. The voltage should remain high with these circuits on. How to check the alternator voltage output is one more simple check-up you can do on your own.
The other car I have which had a new alternator put in about 30000miles ago showed 142V - 144V when its engine was running.
The Normal Alternator Output Voltage by Jay Motes. Alternator Charging Voltage. Good alternators measure the voltage at the battery terminals and use whatever voltage at the alternator that is required to obtain good voltage at the battery terminals. A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery.
