Should only be the 30A wires coming into the trailer, the wires going to the 12v side out to the batteries and then the plug that goes into the converter center(looks like a regular plug in type cord). Pretty straight forward. Just note where everything goes. Take pics with phone. Remember to disconnect power first!:) I've always found good prices from
Adventure RVBe sure to check the torque specs on the screws, or tighten them really well or you could be buying another one sooner than expected.