Using 100 amp mopar alternator to charge batteries out of a vehicle

Vreg senses and attempts to control dV between its I input and its case (see post 7 drawing). The case thus needs a good connection to BATT-. Also insure that I is the same voltage as BATT+ (within 0.1 V). The voltage setpoint is fixed in Vreg. Most of my Mopar cars run ~14.3 V when the alternator is working, indeed even my M-B cars run the same (GM/Motorola style alternator).

I think the newer electronic Vreg's continuously change the alternator field current to adjust the voltage output, whereas the older relay type just turned the field on and off. Either will keep the battery charged, but continuous control avoids switching glitches, which other electronic devices appreciate.