After reading that you mentioned a MSD ignition coil I realized that you have a 700 series car. I do not claim to know much about these cars, as I only own 200 series cars.

From what I can gather is you suspect the coil not firing even though it has power at both terminal. On a 200 car, terminal #15 is 12v and the ECU/ICU module grounds terminal #1. The MSD terminal will have to be cross-referenced. I do not know what you mean by “swapped out the ignition pack?”

You can disconnect all the wires from #1. Take a wire and ground it back to the battery negative terminal with the key on or in running mode. You just shortly flick the ground wire to the terminal. Each time this should fire the coil wire to a spark plug lying on the engine and complete a circuit to ground. If this does not happen, suspect the coil or the wire to the spark plug.

If it sparks just fine, the coil is good. You then have to suspect the Crank Position Sensor. This you may have gotten wet and it is grounding the signal out because the wiring goes bad.

The CPS has to tell the ECU/ICU module the engine is moving. The module turns on relay to run the fuel pumps. Internally to the module, is also firing the injectors and should be firing the plugs by doing what you did with the wire to terminal #1.

You said the plugs were dry. This is a clue that splits things and may be what is causing the stumpers!

I will leave this 700 series car there because I have no clues where all this stuff is. Others can help where I cannot.

Phil