Tail lights problem

Today my mom told me my tail lights weren't working, none of them. So i pulled one out and found out that they actually do work, but they are just not bright at all. So i was wondering if anyone knew what this could be. Any help is appreciated, Thanks, Phil.

It's probably a bad ground. The ground wire for the tail lights is attached to the frame somewhere under the passenger side quarter panel and can be a nightmare to get at. Instead of disassembling the entire rear body I pulled off my rear bumper cover and cut about 1/2 inch of insulation off the tail light ground wire (It's black and thicker then the other wires) and soldered another wire to it. I connected the other end to the frame with a sheet metal screw. Instead of soldering you could also use a tap splice (also called a suitcase connector) to tap into the ground.