Sudden problem with 2 interior lights in '65 Globetrotter
I bought a '65 Globetrotter a few weeks back and am trying to get some things ready for a trip on the 17th. Tonight I had something strange happen and I'm not sure what to check for. On either side of the front couch there is a wall mounted light with a twist switch to turn it on and off. These switches were weak and worn from age so I replaced them today with new socket/switch assemblies. I only had one light bulb out there with me so I tested one, then pulled the builb and tested the other. They worked fine.
Tonight my wife and I are out there working on some other stuff, drawers, etc. One of the lights is still on and had been for about 4 hours. I had mounted another lamp in the rear and asked my wife to turn off that light so the bulb would cool so I can swap it into the other one I had just mounted. I pulled that bulb and put it in the new lamp and turned it on and the bulb blew. So I went in the house and got some new bulbs, put one in the lamp I had just installed and it worked fine. Put a new bulb in one of the front lights and it didn't work. So I changed to another bulb. Still nothing, so I tried the light on the other wall and nothing there either. Then I got to looking and when I turned on the one on the left it would barely glow.. really faint. You could barely see it and it's a 60 watt bulb. The one on the right doesn't glow at all.
The light I installed at the rear is not a permanantly wired lamp. It has a cord that plugs into an outlet, so that shouldn't have a bearing on the ones up front which are hardwired into the wiring inside the walls. Everything else up front works... Outside light, ceiling lights, water pump, fridge, microwave, the wall plugs... Just those two lamps are screwed up. Any ideas on what I need to check or how I need to go about trying to diagnose the problem? I am not an electrician, but I can wire a whole house from scratch, but I'm not very savvy on trouble shooting stuff like this.
Thanks for any ideas.