If we are talking about the regulator on a 600Ss it should be a single phase one with the two Yellow wires and look a bit like this one here
https://regulatorrectifier.com/catal...ges/EDL450.JPG I can't recall which fuse is which as with the 5 looms I have modified so far I have done away with the box as well the large connector that joins the front harness to the main harness, Also done away with lighting wires, indicator wires etc
Checkout the Desmo Due Paddock on Facebook