74 duster electrical problems

Ok dart
The old alt checked out good. so I didn't have to purchase another alt. I guess the only thing left in the system is the regulator. The reg is grounded good and I checked the wires. The green on the bottom field checks good to the connector on the regulator. The other field wire goes to the ballast resister and back to the other voltage regulator terminal. How do you test an electronic voltage regulator?

Big Block