Electrical Help Please

I would take the battery out of the car, charge it up, and take it in for a load test.

It sounds like your charging system is working reasonably well, based on the information you have provided. As said above, you may have too much electrical load for the alternator to keep up. Do not just switch in a higher amp alternator. Your wiring will likely need to be upgraded to handle the additional current. The bulkhead connectors and the amp gauge are weak spots.

On most Mopars I have driven the amp gauge usually barely moves during normal driving. If you are seeing big swings on the amp gauge, that is likely a sign that the system is not operating normally.

Pay attention to what Mattax says, he is the expert on thus kind of thing.

I have no idea what the wrench test means. We already know the current flowing through a coil of wire generates a magnetic field. All that tells you is some amount of current is flowing.