1968 Dart Radio Removal

If the lamps are twist sockets, you may have a lamp out or a broken twist in socket.
They can be very challenging to replace depending on where they are. Loosening the dash cluster, drop the steering column down, removing the front seat so that you can comfortably get up in there. Could also be a bad circuit board. I do not remember if the '68 is the same as a '69. If you have a broken ear on a twist socket, they are available, there are 2 or 3 different sizes. Circuit boards are available also.