How much voltage?

Not sure.

"Probably" does not not sound firm to me!!!! Concerning the second field!

I have always run the appropriate VR on the the alternator/charging system used! Just my thinking I guess. I do not have items requiring more power than my stock set-up can give me and have always believed the original engineering was adequate based on that.

I know lots of folks have modified and updated and truly believe some of this has sorta got lost in translation and have seen multiple approaches and mixes of it used often with incomplete information! Sometimes seemingly to the point of no approach! I will let some others follow up and watch were it leads you! I always prefer to take the KISS approach, unless I need more than what the factory design gives me.