69 valiant electrical gremlin turn signal and license plate light

Now for the turn signal.
Turn signals works. So the continuity test isn't going to show anything different.

One reason a turn signal will freeze is that one of the lamps in the circuit is out.
Question. Do any of you car's sidemarkers have lights in them? Also are there turn indicators on top of the fender.

The headlight relationship I'll need to think about but I suspect something is crossed or disconnected. Maybe a ground related to the instrument lamps panel.