Help with no headlights. 1974 scamp. Blinkers come on instead...

Not stumped. It's more like you're shotgunning, hoping to hit something.
For blinkers, look at the other guys thread about blinkers for how they work.

So with my cluster out entierly, and the 2 ammeter wires tied together, my blinker issue persists. U would say that eliminates the headlight switch...
This means nothing. All you've done is removed the gage that tells whether current is flowing out of the battery.

With the cluster out, and the dimmer switch unplugged, the dimmer switch plug has grounds on the outer.
This may get you closer. The connector outers should go to the headlights first and then to ground. It should show ground with the resistance of at least one filament.
I see in the diagram that the driver side bulkhead has several headlight wires running through it.
Yes High beam and low beam.

Am i dumb to assume "red" is hot on that plug...so sending power to that wire should turn on the lights?
Not sure which plug you are looking at. If you're looking at the hi/low, according the the My-mopar diagram, red is high beam. Its probably right, but you can check the shop manual or just look at the stuf you have pulled and see if it makes sense.

Yes, have dome light.
OK.