Headlights, Headlight Motors, and Side Markers Not Working - Retractor Control Relay Unplugged

Headlights, headlight motors, and side markers were all non-functional, while turn signals, brake lights, hazards, reverse lights, and fog lights all worked correctly.

The retractor control relay (headlight retractor relay) had been accidentally left unplugged after a previous fog light modification. This relay controls the headlight circuit including the headlight motors and side markers, so disconnecting it disabled all those systems.

High confidence — Original poster confirmed this resolved the issue