Hi Kev,
Hmm. Sounds wierd.. I'd start at the obvious. You tried the plug, so we know the plug is not the issue. You removed the kill switch, so that is not sticking. Maybe make sure the wires are in correct order. It's pretty simple, black/white to black/white and so forth. Usally can't go backwards. Make sure water did not get in the connections and may have caused rusting.
Also, pull your flywheel cover, make sure it is not full of water. If you have a flywheel puller, pull the flywheel and make sure it is not rusted inside and check to see if any wires came loose.
Also, when you pull the flywheel cover check that the flywheel nut did not come loose, I've seen this happen. Also, check that the flywheel key did not snap.
Just a few things. Hopefully we can get this sorted out for you.