Ignition Switch Question

[Wheel-N-It 2,976]

 Hey Guys, one of todays Wheel Horse duties was to replace the starter solenoid and ignition key switch on the 418-8. This tractor has a 18hp Kohler Magnum. I have some new Toro switches here that I bought from Dale at the Big Show this year. I really like doing business with Dale, he is a good guy. Anyway, I matched up the old key switch to one of the ones I bought from Dale, part number 103991. Everything plugged up fine and the tractor started right up and ran fine but would not shut down with the new switch. So I put the old one back in and it works fine. The charging system is working correctly with both switches and charges at 14.05vdc. 

So I guess my question is do I have the correct switch but it is faulty, or is that not the correct switch? If it is not the correct switch, will someone give me the correct part number, and if possible tell me what the 103991 works on. This is a Toro part number. Thank you for any help you can give me.

[AMC RULES 37,196]

My apologies to you Van...  

as I originally posted in another thread. 

Unsure why my post appeared here.   

 

 

Edited September 18, 2016 by AMC RULES

[BESTDOGEVER 218]

I'm pretty sure that is the right switch not shutting down would be a ground issue possibly in the switch itself 

[N3PUY 1,031]

Just last week I had a Murray that would not shut down.  

If I wiggled the switch connector it would.

It did not have a wire for the ground terminal. (blue arrow).

It only grounded thru the switch housing.

The problem was that there was no contact with the terminal and housing. (red arrow).

With a small hammer I tightened up the connection peening over the housing.

Worked fine then.

 

Make sure your Magneto wire goes to the "M" terminal.

 

 

 

Edited September 18, 2016 by N3PUY

[Wheel-N-It 2,976]

So should there be continuity between the blue arrow terminal and ground in the off position?

I'd be more leaning towards a defective switch too were it not new in the bag and it's Toro to boot.

Edited September 18, 2016 by Wheel-N-It

[N3PUY 1,031]

Just now, Wheel-N-It said:

So should there be continuity between the blue arrow terminal and ground in the off position?

Correct!   Kinda!    The blue arrow terminal is grounded all the time.

Either thru a wire or the housing.

It's the "M" terminal that is grounded in the OFF position thru the ground terminal.

 

[Wheel-N-It 2,976]

Ok thank you Gents! So as long as you guys think I have the correct switch, then I can try another one as I bought 4 of them from Dale. I wanted to replace the ignition switches on some of the wheel horses with magnum engines, two in particular, this 418-8 and the 416-8. 

I also bought two other ignition switches from Dale for K engines but have not installed them yet. The part number for those is 103990.

[mystery_enigma 11]

Isn't this an 80's model? I'm new here so correct me if I'm wrong. Like you wouldn't anyway. This tractor would not have a magneto so if the switch had an "M" on it then it's the wrong switch. Hold both switches in front of you and see if the same letters are located on the same prong on each switch My guess is your new one has an M. I blew your pic up and it looks like there is an "M" stamped on the top prong.  I've never seen one where the letters are on the prongs tho. The wiring plug will match both switches to fool ya...

[BESTDOGEVER 218]

You are correct in it being an 80's tractor but it came with the kohler m18qs engine  which was magneto fired just solid state which eliminated the points and condenser. I think the mag ground wire goes to that terminal and the switch connects it to ground in the off position 

[Wheel-N-It 2,976]

23 minutes ago, BESTDOGEVER said:

You are correct in it being an 80's tractor but it came with the kohler m18qs engine  which was magneto fired just solid state which eliminated the points and condenser. I think the mag ground wire goes to that terminal and the switch connects it to ground in the off position 

Yes, the 418-8 is a one year only tractor to the best of my knowledge. It runs off a magneto. I think BestDodgeEver nailed it.

[BESTDOGEVER 218]

I  have a 418A  and also am working on swapping the Onan in my 518h for an  18 magnum  and the switch is one of the changes necessary  as the Onan is coil and trigger fired different switch types 

[Wheel-N-It 2,976]

3 hours ago, BESTDOGEVER said:

I  have a 418A  and also am working on swapping the Onan in my 518h for an  18 magnum  and the switch is one of the changes necessary  as the Onan is coil and trigger fired different switch types 

That is true, you will need to change out the ignition switch. 

BestDodge, once you have completed the swap, please post some information on how the magnum 18 compares to the onan 20. 

I don't know if this has been discussed here. I am a big fan of the magnum 18hp engines.

Also why did Wheel Horse only use the M20 in the 420 tractor? Seems like that would have been a great engine for the 520 series.

Edited September 21, 2016 by Wheel-N-It

[squonk 43,899]

Try grounding the switch with a jumper. I'm wondering if your hood stant may be a little loose and not grounding the switch.

[BESTDOGEVER 218]

They did use the m-20 in the 420lse. I think the 2 18 horse engines are pretty close to even in power the kohler just has less issues part of which is due to the Onan's size and being cast aluminum