Yes she is a Mustang. Bulbs are 1157 and both flashers are 552 and new. The turn signal switch was pinned correctly as the turn signal have been working.
One thing I should have mentioned in my original post is that this was an intermittent issue that appeared now and then after the instrument panel was removed then reinstalled. I have removed it quite a few times of late replacing items like gauges, bulbs, instrument voltage regulator, wiper switch. With that all said, the turn signals stopped working after a recent reinstall. Sorry should have added that in my first post.
Also I have checked all of the panels connectors and wires and everything appears OK. Im thinking maybe a ground issue on the turn signal circuit?
Also when I did a voltage check on the turn signal flasher and its connector, 12V was appearing in the meter when the turn signal switch was clicked right to left. When centered at off, no voltage showed. Now with the flasher in that circuit should the volt meter have flashed on and off thus showing 12V, zero, 12V, etc etc?