The alternator on a 2018 mitsubishi outlander along with many other vehicles has a 4 wire connector going to it. They are labelled as follows:
Ground - is self explanatory.
Sense - is the input that the alternator is suppose to use to regulate its output voltage with.
Lamp - is suppose to allow the alternator to tell the car to turn on the red battery lamp on the dashboard when it has a problem.
Field - I do not understand what does. I'm not sure which way the communication on this wire occurs or what its purpose is?