Who knew so many people would become so emaotional about this simple question!

In my earlier post, I did not realize this had rubber isolators on the mounts. In that case, you will most definitely need to use the ground wire on that stud. I would use an 8 ga wire or bigger. As said before, run it to the engine block and make sure the engine is grounded well via ground strap.

I am used to the old school, "we never use ground wires just ground through the mounts" electrical components. The older non-isolated alternators just grounded through the mounts (no rubber) so that's what people here are probably thinking of....