I have 12 volts at the wires to the dimmer wheel. The only light that has worked this year is the aftermarket tach for about 10 seconds one night.

The lights all used to work.

COuld it be just one blown bulb causing this? I wouldn't think so since the tach lit up for a short time. If it were the ground for the tach it wouldn't read the RPMs would it?

It looks to me that a couple of the dash lights are gone, but they weren't there when the lights worked before.

Should I just keep trying to find a blown buble someplace? Is there a ground for the system that I need to find and check?

69 B body. Standard dash.