Charging problems 67 Barracuda

The black plastic box is something custom. Unless you know why, I would re-wire it more standard. You probably smoked your VR by grounding the grn wire, so buy a new electronic type (~$11 rockauto). Some look like the original ugly black box and some are thinner chrome. Connect the green wire to its "fld" terminal and to a terminal on your alternator which is not grounded (check w/ an ohmmeter). The other alternator terminal should be grounded, which you can do with the existing black wire.