Alternator Grounding??

[Stpndsmnn at aol.com]

I had an alternator go bad this last weekend and while I was installing it's
free replacement (thanks NAPA) I started to wonder about having a ground wire
for the alternator.

On my CGT all I have is two big red wires going to the same terminal and one
small blue wire which I am guessing is not a ground since it goes into the
dash...

Am I missing a wire?   Would a ground strap to the block help? hurt?  Does
the alternator ground through it's housing?

Thanks
Matt Kramer
'83 CGTt