the ground side control you are referring to is the 70/ later unit, but that fact has nothing to do with poor ground.
The one he wants replaces the 69/ earlier unit
a poor ground at the regulator with EITHER system, as well as harness voltage drop.................causes overcharge
MOST early (69/ earlier) regulators you ask for in a parts store by application (Just tell them a 68 dart etc) will be an electronic regulator in a "mechanical looking" box
