MSD Questions

Whitey, the white wire is used with a points distributor or a ready to run electronic distributor (one with three wires) where it would connect to the wire coming from the distributor that would have connected to the - on the coil.

If you are using a mopar electronic or some other electronic that has two wires coming from the distributor you use the green and purple and the white is not used.

The small red wire needs to connect to switched 12 volts. If you use the blue wire that used to connect to the + of the coil you can remove (but do not have to) the ballast but you need to put a jumper wire in it's place. The reason is the up stream side of the ballast has power when the key is on but not when the starter is cranking and the brown wire on the coil side of the ballast has power when the engine is cranking but not when in the run position. The MSD needs power in both conditions.

The MSD instructions are quite clear and you should follow them, if ou don't have them they can be down loaded from MSDs web site.