ign switch would be my first thought (mainly cuz it didn't act up till you switched the key on). regarding the relay pull the yellow wire terminal off of the relay & jump 12V to its male terminal on the relay to crank it then remove the jumper & see if it stops cranking. I'm assuming that it has a clutch pedal ground to make you start it in neutral, that is strange that it too is inop. it would have to be grounding the black wire on the relay (+fire to the yellow wire) for it to be cranking unless the starter relay is stuck closed. keep us posted