And here it is without the typo:

Ok, there just *might* be a 4th possibility. If the cable bundle containing the wire to pin 30 includes a wire that sees a very high current spike, in theory, that may introduce a voltage spike in the wire to pin 30. I guess the wires in the bundle may have to be twisted for this to occur. If your pin 30 wire wraps around the starter cable a couple of times, it may even be likely. (Actually haven't done the math on it, so have no idea of how likely).

Finn