Might sound stupid but is the middle (top to bottom not the center brake light) light supposed to be on with the tail lights or just the turn signal? It's a single filament bulb so logically it's just simply a turn signal but I seem to recall until last week it was on as a tail light as well. Am I crazy? Thanks, 1

 

Shop manual shows the central bulb as turn signal light. Easy enough to check manually.

The brake light and tail light are the same bulb, but is the top bulb in the lens assy.

good luck