voltage regulator on 1990 Chevrolet Corsica

where is the voltage regulator located I have replaced the alternator , spark plugs and fuel filter I have a battery charger that checks voltage and says bad voltage

Asked by for the 1990 Chevrolet Corsica
The voltage regulator is located in the alternator The voltage coming out of the alternator should read 13.8 to 14.2 volts Did you check the battery, should read 13.2 volts