Thank you for your answer. I will not be using a battery isolator cut off switch (i don't race the car) I have a 1/0 welding cable running from the trunk battery to the front where the OEM battery used to be, that is where the BMW battery distribution block will be installed. I will transfer all the OEM cables that were connected to the battery to the distribution block to keep it as OEM as possible. If i am doing anything wrong, please correct me. i will be doing the transfer in a couple of days. Thank you for your help.