It depends on which voltage regulator you are using. If it's the old mechanical type you'll have one wire coming from the regulator to a field wire and the other field should be grounded. On the newer Mopar "flat" regulator There should be key on power to the blue wire on the regulator and also to the blue field wire. Then the green field wire runs back to the regulator to be grounded by the regulator. The regulator must have a good ground. You can check the alts output with a meter on the stud on the back of the alt. You can eliminate the regulator and check your alternator if you have power on the blue field wire, unhook the green field wire and run a ground wire from the 2nd field to ground. Do this just for a moment though cause if the alt is working it'll charge wide open. That way you'll know if its the alternator or not.