Upon inspection the next morning, I discovered that all the lights on the driver’s side were out — high beam, low beam, and turn signal — with only the marker and fog lights still functioning. That led me to believe the issue wasn’t a wiring or grounding problem, but possibly old or blown bulbs. I had replaced the high and low beams with LEDs about four years ago, but the other front bulbs were still the original bulbs.
Once I began the project, I noticed that the headlight lens had also begun to oxidize internally. Since I was already replacing the bulbs, it made sense to replace the entire lens assembly while I was at it. However, this turned out to be more involved than I expected — in order to remove and replace the headlight housing, the front grille assembly needed to come off as well. The same applied to the turn signal and marker light units; removing the grille provided much better access and made the process cleaner and safer.
(See attached photos for reference.)
