Curious on why you had to get the box updated Emil? Is there a new version?
I had small issues with wiring also Alex. I ran the fattest cables available back to the trunk battery for both positive and negative to start. Then my Gold Box gets a direct wire to the positive post on battery.
As for grounds using 4 ga. cable I tied the heads and block to a ground bus bar which ties to the negative cable back to the negative battey post. Gold Box grounds to the heads and all other grounds run to the bus bar.
