Charging problems 67 Barracuda

So the two black wires on either side of the alternator are both the same color (black) and gauge. The one on the left in the pictures runs to a ground on the firewall. The one on the right (attached by the nut) appears to run to a sliver box just below the VR. The black square is the VR and the last picture is the silver box the alternator lead runs to.

The old alternator was hooked up just like the pictures I attached, including the green wire hooked up in the center. Although there was a different style connection to the alternator, as I mentioned. A clip instead of a set screw / bolt.

If I switched the left black and green wires would that solve the problem? Or take off the left black and put the green there? Just guessing.