Just looking at this thing, it seems it would be simple, but there are only one open wire for each switch. I know I need one wire coming from my accessory to the switch, and a wire going from the switch to the battery, but there is only one wire with a small connector on each switch. Do I shove two wires into that one connector? I don't see anywhere else to add wires to this thing. Each of those gray wires have connectors on the end to attach an incoming wire, but all the other wires on this thing are routed right back into the switch.