Mondial T side lights - electrical problem

I recently had my 1989 US Mondial T inspected for the tag (just check lights and things). They found one side marker light was out (left front) and ask if they could put a buld in it. I told them yes and watched them do the replacement. All marker lights worked for about 10 seconds and all of them went out. They went ahead and passed the inspection and I took it home. Checking fuses I don't see anything blown. Front and rear parking lights work but none of the four side market lights come on. The fog lights are not coming on now either. I am suspect of with the light switch arm on the steering column, fuse box, or just a bad connection somewhere. Does anyone have any ideas on this that could narrow down my debug procedure since this seems like a daunting task to debug.