Help, No power when turn key

Sounds like your ignition switch is bad, with both the ACC and START (IGN2) positions failed. However, it could be in the wiring, though the ACC circuit doesn't go thru the bulkhead like the IGN2 wire does. You didn't state which car, if the 67 you are in luck since the ignition switch is easy to change and only costs ~$12 as I recall.