I don't like asking questions for other people because of the lack of vehicle in hand, but here it goes:

I'm dealing with this girl's fourth generation ~1997 Camaro RS. Left turn signal stays solid and only lights in the rear. No light in the front, not even the running light. Everything on the right side is OK. All other lights are fine. She claims that putting a new bulb will fix it, but only for a few days.

We are in Oregon (yes, it's very wet) and there appears to be condensation in the housing, but this started happening in the summer though. Without a closer look I don't know what to expect besides corrosion in the socket. Any insight?

 

Yes, putting in a new bulb will fix the immediate problem for a while. F-bodies are notorious for getting water in the front signal housings and corrosion in the sockets. Replacement sockets are available from Advance Auto and some other auto parts stores for a fraction of what the dealer charges. Tell them you want "pigtails" because it's been my experience that they'll start walking toward the tool section if you ask for sockets. Put some dielectric grease in the sockets before installing them to help prevent future corrosion.

The housings are OEM parts that are only available from dealers and other GM parts outlets. However, if the original housings aren't broken you can usually seal them up pretty well with caulking to help prevent water problems.

 

Sounds good! I'll see what happens if it ever stops raining.

 

This is the same issue I just posted about. Are her side markers working too?

 

I had the same problem. I put some dielectric grease in the socket and on the bulb plug. It's been months with rain and washes and no problems. Trust me it will fix it. And be liberal with the grease, clump it in the socket.