Here is my problem. I have a 55 champion that the po converted to 12 volt negative ground. There was no ignition switch so I purchased one from Studebaker Intl. The back of the switch has 4 posts marked BAT, IGN, ACC and ST. The wiring diagram in the shop manual lists AMP, COIL, ACC and S. Hopefully one of the great ones here can tell me how they correspond to each other. I know ACC is the same on both switches but I am not sure about BAT and IGN. I dont want to wire this backwards and fry something. Thanks for any help you can offer.