[URL]https://www.forabodiesonly.com...-duster-wiring-diagram.494362/post-1973509389[/URL]
You can dig around the ' net and compare photos and diagrams of other standard '73 and '74
for example
[URL]https://www.forabodiesonly.com...ignals-not-working-blowing-fuse.508597/page-2[/URL]
Before you get too deep:
If your car was equiped with a rear window defrost grid, then it got a modified harness.
If your car was equiped with a 'fleet' alternator,but no rear defrost grid, then it got a different modified harness.