Quick way to test the alternator is to unplug the regulated , find the field wire on back of it, Orange cap , it’s close to center of the end bearing , get a wire that will reach the battery and that temeral , start car and touch it , your volt should rise quickly , don’t leave it on to long because it will fry other things with high voltage , turn on head lights if you don’t have a volt meter , the lights will go bright when to jump the battery streght to the field , but if nothing happens it’s the alternator