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The issue you are having is definatally electrical in nature. Start under the dash at the key switch and insect all wiring that is going to the engine for any loose wires. If you cannot locate any there, move to the engine and inspect all of the plug ins on the ECU and the plug where the wires come from the boat going to the engine. You should locate either a loose connection or a broken wire.
Yes, that is a very good possibly that the switch is bad.
No. the switch is plug and play.
The yellow wire would also do it. Any lose wire on the engine or in the dash can.
I dont think it would be the injectors, you are losing key power somehow.