72 Tail light issue (on a daily driver)

[exmonkeypunk]

Recently, my driver side Tail light quit working. I changed the bulb and had no luck. All the wiring appeared to be decent, so i pulled the socket out and tried a new one. The new one required me to make a larger hole to fit into the housing. Well, i should've checked to see it it worked first. It didn't.
I cannot figure out why my driver light doesn't work. Anybody know of this?
I'm driving the truck daily, so i'm cruising without a left light. I need this taken care of quick like.