Taillight Issue

[c10boob]

My taillights and brake lights no longer work, but both turn signals and hazard lights/emergency flashers still do.

I have checked the fuse, it's good. What other things could cause this?

(Possible hint: I installed a relay for my hazard lights, as there was not one on the fuse box when I bought it. In doing so, I detached the ignition wire from the fuse box accidentally, so I put it back, and later noticed an orange wire hanging with no connector on the end. There is no connector that has fallen off or become detached from the orange wire, it was just never there. The way the wire hangs it almost looks like the previous owner just shoved it into the connector with the ignition wire, but that doesn't make sense to me.)