OK, let's start with the usual "parts store" questions
What is the make, model and year?
Or to put it differently, are you running a stock Mopar alternator?
Are you running 69/ earlier regulator?
Are you running 70/ later regulator?
The "quick test"
69/ earlier. If the following does not work, repeat with your jumper wire connected
Disconnect the field wire (there's only one) and clip lead from the output stud on the alternator to the exposed field terminal on the alternator. There should be a small spark, indicating the field is drawing current. Start the engine, ease up the RPM, and the voltage should climb. Monitor the voltage and don't allow it to climb too high. Much over 15 is too high. This is a quick test that shows:
The brushes are making contact, the field is good, and at least PART of the stator and diodes are working.
The above test will separate the problem into a "rough half", IE the alternator is good/ bad, versus the regulator/ regulator wiring.
1970/ later: This has two field connections. One comes from "ignition in run" so right from the battery, the other field is a "controlled ground" by the regulator
Quick test. Just as with the 69/ earlier, except pull BOTH field terminals off, connect one (does not matter) to ground, connect the other as above to the output stud.
