Charging issues help please.

To answer your question on the 2 field wires, no, it is not for START and RUN. The blue wire is the 12v feed from the ignition in RUN, and the green is the return to the regulator. The regulator works in this setup by varying the amount of reisistance to ground from that green wire connection; that varies the current flow through the filed winding and regulates the voltage out of the alternator.

If the alterantor checks out at the shop, then try this:
- Clean the metal to metal surfaces and scrape to bear metal where the alternator contacts the brackets and the brackets contact the block
- Make sure you have a - lead of the battery connected to clean metal on the block, and the ground strap from the back of the passenger side head to the firewall. Scrape these clean to bare metal too. Sorry if it is nice paint, but these groudns simply HAVE to be good and solid.
- Make sure the regulator case is grounded to bare metal to the firewall.

Disconnect the green wire from one alternator field connection and turn the key to RUN. There should be 12v at the blue wire to the alternator. Then re-connect the green wire and start the car. Measure the following with the - lead of your meter at battery - :
- Battery + voltage
- Alternator case (shoudl be very near to 0 volts)
- Voltage at the green wire on the alternator; should be around 2-3 volts less than battery + voltage