How to replace an old ignition switch

[burnamrubber]

Hello! I bought a 1964 Ford truck and have a problem I hope someone could help me with. The truck has an old ignition switch what looks like came off a 53, 54 or 55 Ford. It does not work correctly and I want to replace it. I bought a new one with a spring on it but it has four male ends where the old ignition has three. What is the correct way to install a new ignition seitch? Any help? Thanks, John
jhickcox@windjammercable.net