Farm Equipment - Magneto wont stop!!!!!!!!!!

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Magneto wont stop!!!!!!!!!!

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=10784
Printed Date: 23 Jan 2025 at 7:32am
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Topic: Magneto wont stop!!!!!!!!!!

Posted By: Ryan Renko
Subject: Magneto wont stop!!!!!!!!!!
Date Posted: 08 Apr 2010 at 7:29pm

I have a Fairbanks Morse Type FM-4B magneto on our restoration tractor (Minneapolis Moline) and altough we were very pleased to get the old girl running, it wont shut off!!! We have a new kill switch and the wire is new to the magneto cap. I even tried to ground it using a screwdriver to the button on the cap and frame, and she keeps on running like the Energizer rabbit. Any ideas what to look for??? Thanks in advance, Ryan

Replies:

Posted By: Steve in NJ
Date Posted: 08 Apr 2010 at 7:36pm

Sounds to me like the shut down wire from the points to the ground lever isn't connected at one end. You'll probably need to get inside and see if the wire is off...
Steve@B&B

Posted By: Ryan Renko
Date Posted: 08 Apr 2010 at 7:41pm

Magnetos are a new thing to me, and I was glad it worked!!! When I took the cap off, the post that the kill switch connected to wasnt hooked to anything!! We were not sure what if anything was missing. So your saying it connects to the points somehow??

Posted By: Jeff Z. NY
Date Posted: 08 Apr 2010 at 7:42pm

First we had runaway Toyotas now we have a runaway Minneapolis Moline. LOL

Posted By: Ryan Renko
Date Posted: 08 Apr 2010 at 7:47pm

I can assure you Jeff this tractor does not have the complex electronics that that car has!!!LOL

Posted By: Steve in NJ
Date Posted: 08 Apr 2010 at 7:54pm

With the 4B in particular, the large retangular cap has a grounding pin @ the top of the cap. This pin in turn contacts the points breaker plate inside. Outside there is usually a "candycane" style grounding lever. You can also attach a remote kill switch to the grounding pin to kill the Mag remotely. If you don't have a grounding pin kit, I have em' in stock for the 4B and "K" series F/M's. Drop me a line if interested..... HTH
Steve@B&B

Posted By: Chalmersbob
Date Posted: 08 Apr 2010 at 9:02pm

If te grounding wire is disconnected inside of the mag, it needs to be connected to the same screw as the condenser. which is at the bottom of the opening, below the points.

Bob