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Rich,

Not sure about the specifics of your motor in terms of number of power packs, etc, but a good place to start is knowing that in order for the engine to turn off, there's a wire coming from the power pack(s) to a terminal on the ignition switch (black/yellow wire on my schematic). Now when you turn the engine off, this terminal is connected through the switch to a wire on another terminal that goes to ground (black wire on my schematic). The engine will not run when this wire is grounded. When the engine is running, this connection is open and the power pack lead isn't grounded.

A quick way to start would be to turn the new swtch off (wires disconnected) and check continuity between the terminals, and the two that show a connection in the off position are the two that should have the above wires connected to them. On the schematic I have for my V6, the ignition switch has 6 terminals, and and the ones with the letter M are the ones connected to the wires described above, and they are the only two terminals that have connection with the switch in the off position, and they don't appear to be used at all for any of the other 3 switch positions, start, on, and choke on. Hopefully yours is similar as they're both Johnson.

You may have a bad ground that's floating, or a bad (open) wire to the power pack(s). A quick continuity check will tell you if that's the case. This should give you a basic understanding of what's supposed to be happening. Take a look and let us know what you see. It's a pretty simple circuit, so we should be able to get it squared away.