Wiring harness advice

The year one underhood harness comes in two flavors.

One is the stock harness that works with all the original components.

One is a modified harness, possibly HU200AM for your 1970 dart. This harness may has three modifications:
1. It is wired for electronic ignition.
2. It is wired for an electronic voltage regulator (triangle connector)
3. It is wired for an isolated field alternator. This is the one with two field wires and one big wire for charging.

This was true on my 1968 cuda. I think in 1970 the stock harness already had the triangle connector regulator, and the isolated filed alternator. If that is the case on yours, then the only difference is the electronic ignition. You must still have the three wire alternator and the triangle connector regulator.

I am not sure about your blue regulator. CAn you post a picture?