Welcome Charger guy!
Head lamps and dash lights on the 66-67 Chargers are rather complicated but there are places around the net to find some good info.
You should stop over at 66-67charger.com There is a resource guide there that is very helpful with trouble shooting the headlamps. Also guys there that rebuild motors, have new limit switches and relays to keep your lights rotating.
With the dash lights you can find good info and guy who are rebuilding power packs and restoring/rebuilding the gauges.
You can not rotate the headlamp buckets manually. Did they just stop working at the same time? There are a few things to check.
1. There is a big electrical connector up in front of the battery. It should have a rubber grommet that runs through the radiator support. Take that a part and make sure all connections are clean and not corroded. All the connections for the headlamps must be clean, any voltage drop in the system and the lights wont work right.
In the same area there should be a black wire with a white stripe that is screwed to the rad support, that is a ground, clean that good.
2. Unhook the connectors at the motors. There are 3 wires, one opens the lamps, one closes and the other is a ground. Hot wire the motors to see if they rotate. If they do that's a good deal!
3. At each motor there are 2 micro switches or limit switches. Unhook them and see if there is continuity in those. You can use a long screw driver through the grille to work the switch.
4. there is a circuit breaker located behind the left kick panel. Make sure there is juice there.
5. The "HOLD OPEN" toggle switch on the left of the steering wheel. On mine if you ran the switch back and for and the lamps would rotate. That switch can be taken out of the dash, taken a part and clean up the contacts.
6. Behind the glove box there are 3 relays, control, open and closing. Can you hear any thing "clicking" when the light switch is turned on or when the HOLD OPEN switch is switched?
I could keep going but those are some of the highlights to check.
Dash lights will "bite" your not careful. A transformer under the dash takes 12V up to 220 to run the dash lights. More than likely that power pack needs to be rebuilt.
Like I said, go to 66-67charger.com and check out the source guide. My dash lights or headlamps didn't work, I fumbled through it, asked lots of questions and got everything working.
http://http://www.chargersourceguide.com/
