wireing question

Blue wires are used for switched 12 volts. You should have one going from the bulkhead connector to the voltage regulator, one to the ballast resistor and one to one of the field winding connections on the alternator. Sometimes blue is also used to go from the other side of the ballast resistor to the + side of the coil.

There was a thread on this site a week or so ago with a link to another site that had wiring diagrams. I would do a search and get a copy of the wiring diagram for your car.