Sorry for the novice question, been a minute since I've done some of my own maintenence. Dealer batteries were identical, but I am putting in a cranking and deep cycle. Which battery is the starting battery? There is one with just the normal cables and the charger cables and the other has the same plus a heavy gauge ground and an additional ground. I couldn't decide if that would be from the engine or the amps. I tried to test the numerical positions assuming 1 is the cranking battery, but with one disconnected, I think the circuit is broken, so I am posting instead of connecting extra battery configurations. Thanks in advance.