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Would you please post the full model number of the engine?
First, make sure that the battery connections are tight and in the correct places.
Was anything done to the boat this last week?
Do you have a multimeter?
Ok, with engine not running, test the voltage right at the battery. Then again on the starter solenoid. If it is above 12V, Have a helper turn the key to start and bold it there, while you are checking the readings on the engine.
does the voltage change?