I am doing mine today; there are 6 lines that come through and two are hot and two of them are ground; they want you to connect them to the battery. I will send them along the right side, across the front with the other wiring, to the battery. I think. Or I might go across the firewall with the other wires. Let me think about it... I punched a hole in my rubber grommet with a leather punch; neater than cutting an X.