I recently acquired a new to me Valeo alternator
to replace same which had failed on my Volvo
MD2020. I pulled the internal regulator
off and swapped in the one from my old alternator
which was already modified for external regulation. Then, I noticed the extra wire on the original regulator
This wire, long black with red heat shrink in pic, is soldered directly to the rear brush. This I assume is a mod for external regulation? If so, then how do you disable the internal regulator when its connected? Just disconnect the B+ lead (yellow wire)?
(My old regulator was modified by simply gutting the internal regular, soldering a lead to the distribution bars in the old housing and adding a couple of high temp resistors to derate slightly).