Jump to content
Sirtowsalot

418-A Won't shutoff

Recommended Posts

Sirtowsalot

Howdy y'all!

I'm having some trouble with my 418-A. I think it is ignition related, but I'm not completely sure. It starts and runs perfectly fine, but when I go to turn it off, it doesn't work. I can just turn the key into the 'off' position and take the key out while the tractor is still running and it will continue to run as if I hadn't turned the key off.

 

I'm trying to keep this tractor as original as possible, so I don't really want to buy a new ignition. Any help is appreciated. Thanks!

 

*EDIT*

Wheel Horse 418-A

Kohler Engine

18 HP

Model No. M18QS

Spec. No. 24510

Serial No. 1619706606

Edited by Sirtowsalot
Added additional details.

Share this post


Link to post
Share on other sites
 
gwest_ca

You have magneto ignition which is self-powered and the single ignition wire just needs to be grounded to the chassis metal or negative battery to shut the engine off. Do not allow any battery power into that wire.

Could be ignition switch, pto switch or seat switch.

With the engine running, pto engaged and you leave the seat the engine should quit. Seat switch should ground the ignition wire. That may help narrow the problem down. The body of the ignition switch should be grounded also so the key will shut it off.

Garry

Share this post


Link to post
Share on other sites
 
Sirtowsalot

Thanks for your response Gwest_ca!

 

The only method I can find to shut off my wheel horse is to pull the spark plug wires. The seat switch won't kill it either.

 

The ignition switch I have only has terminals labeled as : A, M, B, R, S, and 3

 

KEY OFF: A+3, A+M, 3+M

KEY ON: A+B, A+R, B+R

KEY START: B+S

 

switch.JPG

3 is the slanted pin on the bottom right.

Edited by Sirtowsalot

Share this post


Link to post
Share on other sites
 
gwest_ca

Click on the picture. One of the next ones that come up show how to test each function of the switch.

#3 is for a ground wire to the chassis. When dash panels were changed to plastic panels simply mounting the switch in the panel did not provide a ground.

I would check for a bad connection in the ignition wire starting at the engine and work your way back to the ignition switch.

Any chance a mouse has chewed the wire off under the engine tins?

Garry

  • Like 1

Share this post


Link to post
Share on other sites
 
Sirtowsalot

Sorry for the late response,

Where would I start to trace the wiring back from the engine? And yeah, there is a good chance that a mouse may have chewed one of the wires. I'll go attempt to locate the broken wire.

Share this post


Link to post
Share on other sites
 
pfrederi

Find the 3 wire connector like in first picture.  Separate it  The use you rmultimeter set for continuity to probe the top right terminal and the other on the frame or other ground.  With the key switch in the off position you should have continuity (almost 0 resistance)..  If you do not then there is a problem in the switch itself or the wire from the connecter to there.

IMG_0254.JPG

IMG_0255.JPG

Share this post


Link to post
Share on other sites
 
Sirtowsalot

Thanks Pfrederi, I'll give that a try.

If you don't mind me asking, what kills the mower when the switch is turned off?

Share this post


Link to post
Share on other sites
 
pfrederi

That wire comes from the magneto.  if it is grounded the mag stops making spark.  If it is not grounded she will continue to run.  Do not under any circumstances apply voltage to the engine side of that wire connector  you might have very expensive smoke from your magneto

Share this post


Link to post
Share on other sites
 
Sirtowsalot

Thanks for the help everyone. 

I found the black wire with a blue stripe chewn in half... damn mice. I put it back together with a butt connector and it shuts off just fine now!

Wohoo!

  • Excellent 1

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • Gingerbread
      By Gingerbread
      I’m new to this and not sure if I’m doing this right, But I have a 211-4 with a Briggs 11hp and the thing was sold in my town years ago when it was new. it was my grandfathers till now so it’s a nice piece of history. and it has some electrical problems I can’t figure out, It blows the 15Amp fuse as soon as you turn the key, it all started after the I had to replace the the ignition switch. And now it just blows the fuse. I messed with it when it happened but I have been away in the service for about two years, but now I’m on leave and want to fix my pride and joy but don’t know if my wires are all in the right spot. And my brother actually hooked the battery up backwards by accident for a few seconds while I was away so don’t know if that did anything. So any helpful suggestions or pictures for an example to look at. Thanks
    • Vaughan32850
      By Vaughan32850
      New to this forum, Let’s see what other wheelhorse’s are in the UK, I’m in South Wales. 
       
      RJ-58
      Lawn Ranger 
      Commando 8
      C-120
      C-101
      C-160 Auto

    • CeeBee
      By CeeBee
      Good shape. Electric Start. Kept in a shed. Need the space now. Includes Manual. Pickup only.




    • Ifixoldjunk
      By Ifixoldjunk
      I’ve recently gotten into flux core welding and I’ve been making all sorts of attachments for my 310-8. I was wondering what other crazy things people have made for their tractors.
    • illinibrew
      By illinibrew
      I have been into garden tractors for a few years.  Wanted to learn about small engines and buying an old sear suburban was cheaper than the class at the local community college.  Just got a 1980 C85 (with a johnny bucket on it).  
×
×
  • Create New...