No crank

Saying that you are "not getting power anywhere" is not very descriptive. Power "not" where, exactly?

Check power as you follow the diagram------------

You have battery at the battery POST?

at the starter relay battery STUD?

At the RED bulkhead feedthrough? On both sides?

(Now you say this has been CUT?) That means someone has run a new wire SOMEWHERE from the battery, through the firewall, to the ammeter.)
Probably time to pull the cluster so you can "get in there."

Pull the battery ground

Pull the trim piece under the column

Pull the floor flange bolts

Should be 1 bolt holding the column "up in" by the brake pedal, then, last, pull the two nuts on the clamp out near the front of the dash. By gingerly turning the wheel, it should drop down into the seat.

Pull the screws, out of the dash trim, reach up and unhook the speedo cable and fold the dash cluster forward slightly until you can assess the cluster harness connector and unbolt the ammeter connections.

Bolt the ammeter connections together and "safe them off" then hook the battery back up. Now you can more easily get into and see what you are doing.

If the wiring has been hacked, no telling what has been done, or what has been broken...........

your top no1 suspects are

the fuse link or "some wire" ran to replace it.

the bulkhead connector terminal which that wire goes through, or if someone ran a different wire straight through the bulkhead, it should STILL end up on one side of the ammeter

ON the other side of the ammeter, (BLACK) this goes from the ammeter, down into the harness a few inches, where the factory welded splice is taped up. You might want to untape / cut open the harness, from the ammeter ring terminal until you find the splice and inspect it. Then the black continues on, and backout the bulkhead connector

IF THIS has been hacked, there HAS to be a wire run somehow to replace it.

You have a shop manual?

These are not "cuda specific" but t he general wiring is the same:

Main difference is the Rally Cluster

[ame="http://www.abodyjoe.com/pictures/Misc.%20car%20info/69%20dodge%20service%20manual.pdf"]http://www.abodyjoe.com/pictures/Misc.%20car%20info/69%20dodge%20service%20manual.pdf[/ame]