forgot you had a premier power welder setup i just remembered you saying you had a gm alt as well.My setup is a little different. I have a Premier Power Welder and run the alternator that came with it instead of the popular one wire. It's wired like this:
I have a parasitic draw too, that I haven't got around tracing yet. I was following your battery thread with my fingers crossed, hoping that you've solve both of our problems.