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Are you using a standard incandescent bulb or a replacement LED?
I converted every single light (inside and out) on my 67 Coronet to LED's, but when I got to the dome light, I had exactly the same problem you described. With the LED replacement, the light stayed on all the time, even with the...
I think I would just leave the Ballast in place. They're cheap enough to keep an extra or two in the glove box, looks factory, you don't have to do any re-wiring and it's not hurting anything.
I think with a multi spark ignition such as MSD, you definitely can remove the Ballast and you'll be...
Could be the wiring that goes into the fuse box, or could be a bad circuit board. Classic Industries sells new ones that are "modernized" to eliminate the usual problems.
I had all these same issues when I bought my 67.
On your turn signals if your 4 way emergency flashers work, try swapping the flashers under the dash (if you haven't already). If so then someting's most likely wrong in your steering column, maybe the actual switch that your lever connects to...
Yes, it definitely sounds like a ground problem. Along with the bulb, the lamp assembly also needs to have a good ground. Unscrew the lamp assy and move it around inside the bumper, see if it changes when you touch it to metal, or if the wires are long enough, touch the assy to the car's frame...