Had a strange issue this weekend. Engine cranks but would not start. Pull the cover and I do not hear the FP cycle when I turn the key. Put a meter on the FP terminals no voltage. I'm guessing i didn't have spark either since it didn't even sputter. Start checking connections. When I pull the main harness apart and reinstall it starts and ran fine all day. Gauges lite up and worked while I had the no start. No alarms. Is there a wire in the main harness that provides a signal to the ECU from the key switch?
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Crank no start 1999 OX66 250
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May be a bad main relay, number 34 in this diagram Yamaha Outboard Parts 1999 S250TXRX ELECTRICAL 3 Diagram
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