Here's another car lighting problem I've just come across on a 1986 (ish) Volvo 740.
I pulled the DRL fuse as requested, which took all of 30 seconds. However, there's another insidious "feature" on this model to disable. If you are driving this with headlights on and then stop and switch off the ignition, all the lights go out!
I've seen models where you can't get the headlights on without the ignition before, but to have parking/tail lights go out as well is crazy. You have to turn the light switch back to the P position to get them back on.