Battery Relocation Kits

If you don’t have a good ground from your engine to the frame a lot of weird stuff can happen. A lot of guys toss the ground strap when they pull an engine. No need for a ground cable from the batt if your engine is properly grounded, as crackedback has said.
Maybe yes, maybe no
As I tried to point out in prior posts it all depends on the configuration of the car.
I think you Guy's may be taking this the wrong way. I wasn't trying to bash anyone.
You need to pay close attention to the setup. It bit me in the ***, cost me money and alot of aggravation.
Yes a good engine to chassis ground is important.
You also need enough current capacity for the starter.