1973 Dart No electrical power
Just to make everyone comfortable its not drawing too much for the OEM wires, including you.
a. What's Rating on the yellow and the red wire fuses?
b. What's the power rating(s) on the system ?
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Tips when electric seems to be dead.
First, check lights that should always have power even with key off. This lets you know power is making past the main splice (junction). Headlights can be good because you can see them against a wall from the driver seat, and you can see how bright they are while looking at he ammeter. Parking lights, dash, and brake lights go through fuses but are also good.
Then you can check things that only work with key in run.
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tips on the engine bay.

The engine connectors were added to speed assembly according to
@RedFish. They're vulnerable and not a huge help for diagnostics. Since your harness is new, they should not be a problem now BUT if the wires are strained that can cause a poor conenction sooner than later. You got lots of slack by the front of the valve cover. Make shure all of the terminals are well seated in the connector shells and then use all of the harness supports.
