See post on F150 from today

Is this a two stroke 115 model or is it an F115? Big difference.

By your use of the term "main relay" this leads me to believe that it might be an F115 four stroke. Why was the main relay replaced? The main relay has nothing to do with stopping the motor when the kill switch is activated.

My error

Replaced relay errorenously!!

still no idea is it is a f115 or not
Why not post your complete motor model #?

That will identify the motor

They like to keep us guessing.

It is gray. What more information is needed?

115 wont cut off

I have the same thing happening to mine. I replace key switch. clean all conations.

and this one also does not tell any one what motor he has, what is wrong with today's people?

Yeah, exactly exactly my problem with my rideon to! Model No. 01fukifIN0/298

I need some bullets for my rifle.

Please give complete model number.

more info on engine that does not quit

The yamaha is a 115hp 4stroke,model f115 txrd

Engine model

this is a f115 txrd

The engine is made to stop when a white wire at the key switch/kill switch is grounded. If the key switch/kill switch are new then they are believed to be operative and that there is a wiring issue preventing the ECU from being grounded to stop the motor.

Disconnect the ten pin coupler at the front of the motor. It connects to the wire harness that runs to the boat and up to the key switch. You have to rotate a locking collar and then the two connectors will separate from each other. Pull them apart.

Inspect the ten pin coupler terminals for the signs of any corrosion or build up that would make for a poor electrical connection. This would prevent the ECU from being grounded when the key is turned off or the lanyard is pulled.

With the key switch in the OFF position, or the kill switch lanyard pulled, check the terminal in the boat side receptacle that connects to the white wire in the harness. The wire should have continuity (nil resistance) to the terminal that connects to the black wire in the harness.

With your multi-meter connected between the white wire terminal and the black wire terminal flex the harness a bit and see if the multi-meter remains steady or does it jump around a bit? That might indicate a broken or intermittent wire within the harness.

Check the terminal connected to the black wire in the engine side harness connector to ensure that it is connected to a ground source.

Do the tests and then come back here with the results.

Wont cut off

I test both plugs and have no continuity. I also move the wire check the plugs by the key switch.