Small Engines (Lawn Mowers, etc.): Kohler CV16S ignition Problem, engine cranks, interlock switches

Question
Craftsman Mod. 917.271042 Mower Kohler CV16S Type PS43514  No spark-engine cranks fine. Fuel OK (plug damp) filter full.  Engine did run once a few days ago. I have owner's Manual w/ wiring diagram, etc. If I'm reading the diagram correctly, it appears that "Operator Presence Relay #1" would prevent ignition if open. Where is this relay located on the mower? I suppose this is controlled by seat sw. There are 3 relays, but they don't seem to be stacked in the diagram. Are there three separate relays?  Or could the problem be the M terminal of ignition sw. I don't want to replace ignition unit (Magnetron) unless necessary..All help greatly appreciated. Thanks,

Answer
Relay should not cause "no spark"   Separate your engine from the tractor by disconnecting the ground cable from the ignition unit then check for spark.  If you have spark you need to start systematical checking of all your interlock switches including the key switch.

Does all this make sense?