I ran a 6 g with no issues, took it off because I had to machine the alt case to get the pulley lined up. Makes it tough to replace on road.I got one for an E350 like what's in the tech article.
I know the computer controlled "6G" won't work on anything at all without a newer brain box.
Anyway, make sure the stator plug is fully seated. I had this same issue. The terminal pushes back up the shell