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If you look at the top of the Electrical section there is a sticky post "Call for all Generation Wiring Schematics", with in it is a link to 1978 Schematic (pdf reader required).

This contains the wiring diagram for your car.

The Dark Green goes to the temperature switch for the idiot light.
The Dark Blue goes to the oil pressure switch for the idiot light.
The Brown goes to the plastic plug on the alternator, I suspect it's for the alternator light, which is also used generate the inital field for the alternator.

The Pink wire should go to your and distributor from the ignition switch.

Note: The first 2 pages of the diagram are for a '77 the last two are for a '78.
 
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