Just an update to those who may find it interesting or useful. What I ended up doing was replacing my voltage regulator as well. Mine was the 3.0 model. It is much more affordable than replacing the alternator and almost the same amount of work. And, yes, it sits right on the alternator so removal just involves removing two screws after taking the alternator out. My regulator cost $25 online and immediately fixed my 4x4, abs, etc lights.