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Minneapolis Moline Tractors Discussion Forum
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RTS Magneto

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fordfx413

02-22-2020 19:22:01




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I have a RTS tractor. I can not get a spark. I looks like someone had recently replaced the points, condenser and maybe the coil at one time. Anyway to test the magneto to find out which part is bad? Best place to find parts? Thanks




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Bob

02-24-2020 09:54:48




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 Re: RTS Magneto in reply to fordfx413, 02-22-2020 19:22:01  
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That's GOOD to hear.
I seen more than once where guys do not realize that a mag is "self-powered" and put battery current to them.

NOT pretty.



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Bob

02-23-2020 15:01:54




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 Re: RTS Magneto in reply to fordfx413, 02-22-2020 19:22:01  
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When you are checking the resistance from the "kill" terminal to ground, if the points are "open", the coil primary is still shunted across the open points to ground, and you are measuring it's resistance, likely around 0.5 Ohms, so it appears as almost a dead short.

You mentioned "ignition switch", I hope this is a grounding "kill switch", and there's NO connection between the battery electrical system on the tractor and the ignition system!

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fordfx413

02-23-2020 17:30:06




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 Re: RTS Magneto in reply to Bob, 02-23-2020 15:01:54  
Bob, Sorry for the confusion... it is a ground switch.



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teddy52food

02-23-2020 07:31:07




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 Re: RTS Magneto in reply to fordfx413, 02-22-2020 19:22:01  
I do mags as a hobby. I have the testers to check it all out & have a charger for the magnet.



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molinegb

02-23-2020 05:37:22




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 Re: RTS Magneto in reply to fordfx413, 02-22-2020 19:22:01  
All mags on R and Z U G used the FM 4Bk4. U and G had different impulse.



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fordfx413

02-23-2020 14:23:15




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 Re: RTS Magneto in reply to molinegb, 02-23-2020 05:37:22  
I did a little more testing. I have ground to the terminal where the ignition switch hooks to all the time. With the points opened or closed. Is that normal? The wiring looks good, no rubs or nothing. This magneto is a fairbank-morse Type FM



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molinegb

02-23-2020 15:10:52




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 Re: RTS Magneto in reply to fordfx413, 02-23-2020 14:23:15  
Remove wire and see if spark. Check resistance on wire should read infinity. Like Bob says terminal on mag will read low ohms as reading windings in coil. Is there a noticable click when cranking? Should hear if impulse working. A mag off a U or G will not work on a R or Z as impulse different.



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Bob

02-22-2020 20:10:33




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 Re: RTS Magneto in reply to fordfx413, 02-22-2020 19:22:01  
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What is the make and model of the MAGNETO?

Once that is known it's quite likely that a factory service manual for it can be found on-line.

That being said, the MOST likely cause of "no spark" with anything with breaker points is a non-conductive film, or light corrosion on the points.

To clean the points, burnish them by drawing a strip of clean white "cardstock" through them repeatedly, then (with points open), clean any "dust" and residue off of them with electrical contact cleaner and allow them to "air dry" before checking for spark.
If that doesn't help, look for something that's shorting to ground, in the coil-points/condenser wiring, and at any insulators in that area for damage.

Also, is the "impulse" working?

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