Oh we are old by numbers, but young at heart
Don’t trust Carly for batt reg before you check the ISTA ABL procedure, because I found only one tool32 S55 job related to batt reg, and the details are lacking... and I couldn’t find much by browsing quickly DME & FEM CAFD (coding files)
You can make it simple, and just like u said, connect the lead acid batt and see if at least something lights up! Of course keep handy a
Sorry couldn’t resist
