[patrickt]

I looked at the wiring diagram for your vintage car. It's a little different from mine, but not too much. I assume there is no flickering with the ignition switch on, but the car not running. So, turn the ignition switch on, have the car not running, and try jiggling the turn signal stalk to see if you can get the light to flicker. It not, move on to the "trailer" tail light relay that is fastened to the steering column just above your ankles. Wiggle it, rap it with your fingers, and wiggle the wires going to it to see if you can get a flicker. Then move up the column from there to the flasher relay and do the same there. The goal is to find something that you can wiggle to get the flicker.