Headlights on, wont go out!

[coolguycentral]

I took my super 72 out for a joyride a couple weeks ago, she ran great. I pulled up to the garage and noticed the headlights were on. I checked the switch, it was off and no other lights were on. I checked the high beams they still worked. Turned the light switch on, all the dash, parking lights etc. came on no problem, but when I turned off he switch the headlights still remained on. I pulled her into the garage and shut her off and the headlights were still on, with the switch off and ignition off. I disconnected the battery for the evening. I pulled the dash, replaced all the bulbs in the dash, replaced the headlight switch, checked all the other bulbs in the truck, and when I reconnected the battery: headlights on! I looked at the wiring to the sockets and the grounds and have nothing.

Any similar issues, possible solutions, or suggestions that I haven't covered yet?