Since the charging current is relatively small, there should be no
problem connecting the negative terminal to a clean remote location, since there will be minimal
voltage drop between the remote location and the battery terminal.
Specifically, if I have a lot of OEM accessories in my 2008 Jetta 2.5 L SE, that are all turned on (e.g., heated seats, AC, defroster etc), or, if it's really hot and humid outside, and I have AC running at full speed, and the engine sensor is so hot that it turns on the engine cooling fans at full speed, too, and
voltage immediately
drops and stays below 13.2 V (e.g., below 2.2 V * 6), but is still above 12V, is there a
problem with the alternator /
voltage - regulator (mine's a combined part), or is that by design?