Driver Side Taillight?

Maybe I'm just an idiot, but I've replaced the driver side Brake light unit after it went out and now have an LED unit installed but still no light. No running, reverse, or brake light. No light when the vehicle locks or unlocks. I've swapped out both of the fuses for the external lights and still nothing. The light went out after just driving to work, no rocks or any uneven terrain of any kind. What do y'all think the issue is, and how do I fix it? Don't think it's a short, because front and rear lights are grouped together on the relay as External 1 & 2 and both headlights are fine.