We ground all our circuts to the rollcage steel starting at the battery.We also make sure that the heads a grounded to the cage.What you shouldn't do is place any ignition,charging or accessory(delay boxes,transbrake,shifters and etc.)on any common terminal.All critical functions shoud have a stand alone dedicated circut to prevent any feed back or voltage interference.We have seen stacking ground wires and hot wires together on a common terminal or post create havoc.