looking at the schematic and at the tub, both the pumps and the blower are grounded to a buss bar on the side of the spa control box. I followed the green/ground wire from the main connection on the spa and it is grounded to the box as well. I think it's hooked up properly, I just want somebody to say "yes, that is how a three wire connetion is made", for obvious reasons I want to be sure it's correct! The way I have it now I have the ground wire in the panel run to the external box on the side of the home so that box is grounded, from there I only have the red,black and white wires run to the spa, that is the only way it will work without tripping the breaker.
Just for reference sake, the box on the side of the home is a positive disconnect type that I can completely disconnect the spa's HOT wires by removing a stint, that leaves the common and the ground wire going to the spa and even in that scenario it trips the GFI immediately.
Looking closer at the last post, the way I tried to wire it to begin with creates a neutral/ground connection at the tub as well