1968 Dart Fusable Link?

That's a general schematic that I drew.
Schematics show how things work.
Find a '68 Dart circuit diagram. I *think* Ply & Dodge are prtty much the same for '68. Do not use '67.
Wiring diagrams show what wire goes in which cavity in the connectors and the actual wire colors.
Some have more detail than others.
If you need a harness diagram that shows position and mounting etc, as far as I know you'll have to sketch your own.