1973 Dart No electrical power
You've installed a new harness with new engine side connectors, but have you checked the mating terminals?
The damage seen here
and here
may also be seen on the mating terminals.
Those terminals are (in my opinion) actually easier to remove and check.
If the terminal is good, make sure it clicks into the plastic connect (give it a very gentle tug to be sure it won't back out).
There's several threads about cleaning bulkhead terminals.
Also '73 has circuits that share a fuse and connect daisy chain fashion in ways you might not expect.
For example I recall helping someone here with the turn signal power that is joined to the backup light power at the bulkhead like so.
^^This is a reasonable area to investigate^^^
You've installed a new harness with new engine side connectors, but have you checked the mating terminals?
The damage seen here
and here
may also be seen on the mating terminals.
Those terminals are (in my opinion) actually easier to remove and check.
If the terminal is good, make sure it clicks into the plastic connect (give it a very gentle tug to be sure it won't back out).
There's several threads about cleaning bulkhead terminals.
Also '73 has circuits that share a fuse and connect daisy chain fashion in ways you might not expect.
For example I recall helping someone here with the turn signal power that is joined to the backup light power at the bulkhead like so.