My 3rd brake light isn't lighting.

There're 2 lights in there.

Any reason they're not on? (haven't checked with a meter yet)

I had tint put in once and the guy forgot to insert the bulbs back into the reflector box.

I put them back in place and they worked fine.

I put in an amp and a sub woofer. They worked after that.

I neatened up the cables a week or so later and then noticed they didn't work... so I don't know when they stopped working.

Is there a connector somewhere under the back dash I could have tugged on?

I'm going to check with a meter soon... I just don't have one or the time to get to it right now.

Thanks