low/no charging

I would guess someone has added the functionality of a starter relay either in a different type relay, possibly under the dash, or maybe even moved the original relay under the dash. If you are not familiar with the present wiring, you have a long hard road, because anything "we" would say is just a guess. You need to try and backtrack with the earlier owner

You won't have a factory VR, either. Your somewhat poor photo earlier---and I already tried to get through to you on this---is that you have an AFTERMARKET or similar Powermaster alternator.........the VR appears to be mounted right on the rear of the alternator. This is NOT a factory VR. These are a third party or aftermarket device which "acts like" a "one wire" alternator.

The photo below is a crop of what you posted earlier. I am certain there was a "box" mounted on your alternator that the red and green wiring went to?