Don't recall if this was posted before. Near the ***bottom*** part of this link, ~$40 kits are available for converting any common 12V negative ground 10SI/12SI alternator to 6, 8 or 12V positive-ground for either 1- or standard 3-wire operation. Jack E/NJ
https://alternatorparts.com/10si-all-in-one.html#ckits