Overcharging problems

so I tested the blue wire voltage at the resistor and the blue wire voltage at the back of the alternator field wire both came back at 13.8 while the car was running so clearly there’s no loss right then I put a voltmeter to the battery and the back of the alternator both came back at 14.8 and then with a heavy load 15.8 i am stumped I checked all the wiring and everything looked good.