Hoping for a Christmas wiring miracle...

I've seen your first guesses be remarkably "on the mark" so I thought you might have some good gut reactions for me. Here goes...

Friday: '65 with 302 & T5z running beautifully. Electical function at 100%. New voltage regulator in a new 100 Amp one-wire alternator charging as expected. I decide this would be a great time for me to connect the back-up light kit I installed months ago, but had never juiced. Original wiring is already in the loom, but had forgotten precisely where the leads exited the loom under the dash, so I had my paws in there, cluster removed, fishing around for the connectors. They were right above the headlamp switch. I connected them to and through the firewall and have the wires to the transmission ready to be hooked up. However, I was distracted by the little fact that I've lost brake lights and headlights. Brake switch still functioning, and blinkers still light up as designed. No head lights, tail lights or brake lights. Checked fuses both in place and in hand. All have continuity. Ahh, the joy of owning a vintage car!! Whatcha think? Headlight switch gone bad? Knock a ground wire loose? The schematics are not helping much. Thanks, Lance

Miracle granted... Thanks guys

Got a 12V test light. While I was imagining the worst, I thought I'd check the most obvious items first. The headlamp switch seemed to be common to all the symptoms, so I pulled the connector that had the power source and got an obvious arc. As you all suspected, I had managed to knock loose the spade connector where the power meets the switch. It was only a millimeter or two, so it appeared to be in the right place. The whole thing took about 60 sec. to find and correct. I'm a little embarrassed that I got so worked up about something so simple. Thanks for the direction guys.