'67 Dart - No stop lights, turn signals on but don't flash

Mattax I haven't found second flasher yet. Turn bulbs in instrument panel are ok. Thank you for the pics.
Dana67Dart Thank you, I haven't had a chance to go thru the whole sequence that you had provided, but I will. I have had the grill apart, last year though; each front turn signal/parking lamp has a ground wire in place.

I have done some of the earlier checks:
Battery voltage, not running 12.51V
Battery voltage, engine running, initially 13.24V, rising over a minute and stabilizing at 13.42V

The Dome/Tail light fuse was blown.....
The blown fuse was a 15A when it should be a 20A; installed a new 20A fuse. I was, of course, hoping for this fuse to allow the flashers to work but no such luck.
i took a video to show the D-C ammeter reaction to the flasher and stop light switching. I'm glad I have it on video because after going thru LH & RH turn signal (on but not flashing), with and without stop lights, I then tried the headlights on and then the ammeter pegged over to max discharge and BANG, the 20A fuse blew. Please see the video at this link; bear with it right to the end for the more interesting part.

I have quite a short somewhere!!!