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grinchsr

418-8 Keeps Running

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grinchsr

My 1987 418-8 (3118K801) stays running after I turn off the key.  The switch #103991 was replaced a few months ago and was working fine until yesterday.   I cleaned up the contacts at the motor connector but still the same problem.  Another bad switch??

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953 nut

It could be the connector going to the engine needs to be cleaned up or the wire is broken. If the PTO is on and you get out of the seat will the engine keep running? 

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grinchsr

It is only used as a trailer hauler.  Seat switch is long gone and have not even touched the PTO lever since I bought it.

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gwest_ca

Make sure the ground wire going to the side of the ignition switch is connected and in fact is a good ground. That is the one that should be shutting the magneto ignition OFF.

 

Garry

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stevebo

Ray-

Sounds like a mouse ate through some wires. I have an XI that will do the same for a short period of time then cut out

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grinchsr

Thanks    Hey Steve still want to buy it now?    :ph34r:

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grinchsr

I will try running a wire from the switch to the battery ground and see what happens

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biged77

I was going to recommend what you already decided to do - run a wire from the switch to battery ground.  The 418-8 and the other 1987 models do not have a separate wire to ground but instead assumes the switch is grounded through contact with the panel sheet metal.  Using an ohmmeter I found on my 418-8 that the instrument panel was not grounded until I cleaned the contact surfaces and even the bolt contact surfaces to the adjacent sheet metal.  Installing a separate ground wire is the thing to do.

 

Ed

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grinchsr

I just ran the wire to battery ground and it shut off with the key.  Is this telling me to replace the switch?   Garry you were dead on about the white wire

 

 

IMG_3024.JPG

IMG_3023.JPG

Edited by grinchsr

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gwest_ca

There is nothing wrong with the switch.

The problem is the original wire on the switch ground terminal is not grounded for some reason. Could be the wire to terminal connection at the switch is corroded or it could be at the other end of the wire. The diagram shows a ground to the chassis between the ignition switch and the seat switch which is circled. Could have failed there or fallen off.

 

Garry

Tractor 1987 418-8 & 418-A Wiring #810473R1 SS.jpg

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biged77

On my 418-8 there was no wire to ground.  I believe the ground symbol indicates that the switch is grounded at the panel and through sheet metal to battery ground.  But I've been wrong before, maybe the ground wire was just missing on my 418-8.

 

Ed

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wallfish

Use that test wire for battery ground to the switch body, not directly to the kill wire. That will verify the switch is good. My guess is the key switch body is loosing ground through the sheet metal connections. Clean up all of those areas to re establish ground to the dash panel or install a wire directly from the switch body to a better ground point

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grinchsr

Hey Wallfish I just came in from running your test and you were correct.  I grounded the switch body to the battery and it shut off.   Thank you

  • Thanks 1

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