Replacement Solenoid Amazon Link:
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STARTER FITS SOLENOID SWITCH JOHNSON OMC EVINRUDE OUTBOARD 383622 395419 582708 586180 47886 47886T 18-580
Update: as many mentioned be sure to check the neutral safety switch. If the motor spins and does not start it could just be that.
Be sure to check which version fits your boat, the device is easy to replace and cheap. If it looks rusted and bad, just get a new one.
The solenoid is a critical component in the starting of an engine. In salt water it is common for these to rust / or simply 1 wire to fall off due to rust. This causes the engine to not start. It is an easy thing to troubleshoot / check if you are out in the water and trying to figure out what is wrong.
When turning the ignition key you should hear a clicking sound. This is the solenoid engaging. If there is no click it means the key is not allowing power to get through to the starter. Most of the time it is not the solenoid itself that is broken but simply the ignition cable which activates the solenoid. If the solenoid does not receive a positive voltage to initiate, it will do nothing.
You can a small wire to test and see if this is the issue.
