I used to have a couple of MSD 6C boxes with the 5pin connectors. They had a #12 black bat neg -,#12 red bat pos +, and a tach connection on one end and the Chry. 5 pin on the other end. They used no ballast resistor


If looking at the 5 pin going clock wise (12 o'clock)ign hot, mag pick up neg-, mag pick up pos+, coil pos, coil neg.