How Many Volts Should An Alternator Put Out. Unless specified all tests should be carried out with the engine running at 3600 RPM. If the voltage dips below the optimal range then the regulator kicks in to get the alternator to make more voltage.
If you got 142 or more volts the alternator is charging fine. There the voltage should be between 141 VDC and 145 VDC. The voltage should read a minimum of 13 volts.
A good alternator should put out between 135-145 volts.
How many volts should a alternator put out. There will be no setting for 12 V exactly so set to the next bigger number and that will be 20 volts. The voltage should stay excessive with these circuits on. If it does the generator is working and charging the battery.
