The clicking sound from the electrical box sounds like the starter relay. That means that your start switch is probably OK. First check all connections for corrosion and tightness. You are looking for the high current starter wires (the fat wires)... all the way from the battery, in/out of the electrical box, to the starter motor & check the ground wire.
If you still can't find the problem, get a voltmeter and see if 12 volts is really applied to the starter motor lead when the button is pushed. If it is, then you have a bad starter motor, if it isn't then you have a bad relay. I'd guess that you'll find a problem with the wire terminations... corrosion is a normal problem on watercraft.
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