Troubleshoot Electrical Issues & Replace Fuses

What happens here

After removing the old lights, identify the original wiring for each light function (running, brake, turn signal, ground) using a multimeter. It is discovered that the original wiring for the brake lights is not receiving power, and further investigation is needed. Check all fuses in both the interior fuse panel and the under-hood fuse box. A missing relay/fuse for a 'body 12-way' is noted, along with several blown fuses. Replace any blown fuses found with the correct amperage.

Goal: Diagnose power delivery issues to the tail lights and restore electrical continuity.