Not an abodie but still a mopar

just bought a 73 winnabago with a 440 and it wont start with the key the fellow changed the starter solenoid but i think he did it wron he has the bat and starter cable on one large post small white wire to small post and 2 other smaller wires to the other large post??are the starter and bat not supposed to be on opposite sides?? frustrated and google has nothing!!!