Yeah I was wondering if it mattered I noticed one had a copper lead the other didn't which is the one I grounded and I know my ammeter gauge was working good
It doesn't matter. I used to have the same question, so hopefully I can now explain it.
The field terminals on the alternator each connect to an end of the copper wire windings. The field is an electro-magnet. When power is put through the windings, an magnetic field is created. The magnetic force goes up with more power and down with less. The strength of that magnetic force determines how much electricity is generated by the spinning rotor.
Two methods to controlling the field Positive regulated: One of the field terminals is grounded. The other terminal is supplied regulated power. Negative regulated: One of the field terminals gets power whenever the ignition switch is on. The other terminal completes the circuit to ground through the voltage regulator.