No power lights etc but ignition turns over?

You're making this harder on yourself.

The American Wire diagrams have nothing to do with what is in your car - assuming its factory.
The mymopar image is one of the 2 pages 67Dart273 mentioned as way to better understand the circuitry when working with the factory diagrams.
The factory diagrams are in the Factory Service Manual. Look under 'reference' at mymopar. If its the Dodge version, it will be in the one called "Chassis" Service
You can buy a decent print or digital copy from several venders, and used ones come up for sale with some frequency.

There isn't going to be 'a solution'. In other words this isn't plug in an answer to a question type situation. It has to be diagnosed like we did here.
Read that.
Then do some quick tests to figure out what circuits are open and which are connected.
If you have questions, post them up.
I'm out until after lunch.

Your '74's basic scheme is similar enough to the one in the linked thread to get you started on a diagnosis.
We'll deal with the differences later.