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Assuming you are referring to an outboard boat motor- if the operator should fall or be thrown out of the boat, that lanyard pulls out of the safety switch and stops the motor.
Faulty wiring, faulty ignition switch, or possibly a faulty neutral safety switch.
Ignition safety switch lanyard is the device on a boat that is most important in preventing propeller strike injuries.
to shut off the engine if the operator falls overboard
A boats safety chain is used to prevent accidents such as a boat slipping from its trailer. This can occur when the ratchet mechanism (used to act as a stopper on the winding crank) breaks. I've seen this happen once at my boatclub. A guy tried to put his boat down the ramp and didn't have his safety chain connected and his boat just slid off the trailer and onto the concrete ramp.
Not a valid assumption... ignition switch could be defective. To check which is bad... There are several places on the solenoid of interest;. There are heavy wires... one long to the battery, the other short to the starter motor itself. There are thin wires ( one or two)... If two, one goes to ground. The other is the lead from the ignition switch. If you jumper from the battery to the heavy lead, and it starts (cranks) then the started motor itself is OK and you could have EITHER a bad solenoid or a bad ignition switch. If you jumper from the battery to the thin wire from the ignition switch and it cranks, then its a bad ignition switch ( or wire to it). If it does not crank...bad solenoid. If it does crank when you jumper the thin wire, then get a short piece of wire and climb under the dashboard. At the back of the ignition switch connect the wire between the heavy wire (often purple or red) and the terminal on the ignition switch with only one wire on it. If it cranks...bad switch...If it doesn't crank...wiring problem. If both of the other switch terminals have only one wire (rare), then the one to jumper is the one furtherst from the heavy wire IN THE DIRECTION OF ROTATION of the switch as you go from off to on to start."
first off boat is boat ok
If your boat runs aground, check the safety of passengers, then check for leaks.
to prevent damage to the hull of the boat and docks.
The state of California does not require you to have a boat insurance but it is important to get the boat insured for your own sake and safety in future.
ignition safety switch lanyard ETA: AKA: the "Kill Switch". Better than that is a good competent knowledge of boat handling and situational awareness. ---------------------------------------------------------------------------------------------------------- While the above may kill the engine if the driver falls overboard, it would have no effect for when the driver runs over a person or an animal in the water. To prevent propeller injury , the propeller needs to be encased in a shroud or guard so that large objects can not be drawn into the blades. In my view all pleasure craft with exposed propellers should be fitted with these but people do not do so because it increases drag.
ignition safety switch lanyard ETA: AKA: the "Kill Switch". Better than that is a good competent knowledge of boat handling and situational awareness. ---------------------------------------------------------------------------------------------------------- While the above may kill the engine if the driver falls overboard, it would have no effect for when the driver runs over a person or an animal in the water. To prevent propeller injury , the propeller needs to be encased in a shroud or guard so that large objects can not be drawn into the blades. In my view all pleasure craft with exposed propellers should be fitted with these but people do not do so because it increases drag.