deere trouble

I have a john deere m665 ztrak went to move it out of barn so i could service it. It cranked up fine at first then died on me. After numerous trys of cranking and shutting down it wont start at all now. Motor turns over good getting plenty of fuel but plug are not firing checked the contact on the coils they look good. Not sure where to go from here do i need new coils or is it one of the several relays?

Got mice??

Disconnect the single wire coming out of the coil.
This is the shut down wire so when it is disconnected you can not stop the engine so make yourself some sort of jumper so you can earth out the wire & shut down the engine.
Crank the engine with wire disconnected if it runs you have a defective switch / relay in the system some where.