How Many Grounds?

The more the merrier. I usually go from battery ground terminal to radiator support. From radiator support to inner fender. From rear of the head to firewall. From where the ground cable connects to the engine to he frame rail.

All that said, there's a strange thing you can set up involving some kinda loop effect that boogers with the electrical system. I forget what it's called, but we've talked about it before. Maybe somebody with more tan half a brain will know what I am talking about. I cannot remember what it's called. But it ain't good.