I recently purchased two 1948 cubs, one manual and one hydraulic. They came as a package deal. The manual has been sitting for years and is a parts tractor although it is all there and should be restorable. The other is in the garage and was a runner last year. I have two magnetos, neither of which worked. I found a broken wire from the coil to the post, repaired it and it sparks great. After some carb issues, the tractor started right up and ran great. I hooked up the kill switch as it was when I got it, to the magneto post. While test driving the tractor, I used the kill switch to stop the engine. It worked but wires started smoking behind the dash. I unhooked the battery to stop the meltdown. I also unhooked the kill switch from the mag post. The tractor no longer runs and the mag no longer produces a spark.
What happened here?
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magneto
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Re: magneto
it sounds like the coil is fried. Did this tractor originally have[a mag. Sure sounds like a short in the wiring that caused the smoke.
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- 10+ Years
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1948 Farmall Cub - Hydraulic
1948 Ford 8N
Re: magneto
Both tractors came with magnetos. Is there a way to test the coil with an ohm meter? From everything I have seen, the magneto is independent of all the wiring with the exception of the kill switch and that connection is just supposed to ground out the magneto. I believe due to an incorrect connection, power went into the magneto the wrong way. I am not good at electrical but the only things I see inside the magneto is the condenser, the points and the coil. Could I have ruined the coil or could the condenser be damaged?
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Re: magneto
First off, G'day and congrats on acquiring your very 1st new to you Cub and joining the MCC at the same time
We have a number of members here who are super at electrics and mags. They will be along to help shortly. And I see one of the masters has already replied... What I can do is what I do best and that is the Welcome Wagon and pointing to our resources of which there are legion.
Below is a wiring schematic for a magneto equipped Cub with Generator, Cut-out, Lights, Starter and a Battery.
As you can see in the parts breakdown above, the coil is contained inside the square cover.
McCormick Farmall Cub Operator's Manual 5-1-49 will work nicely for the '48's, GSS-1012 Electrical Equipment - for the Magneto trouble shooting and of course this one which is all you wanted to know about Magnetos - GSS-5035 Service Manual Magnetos.
Grab a coffee, a comfy chair and spend some time reading the links above and the ones below:
We have a number of members here who are super at electrics and mags. They will be along to help shortly. And I see one of the masters has already replied... What I can do is what I do best and that is the Welcome Wagon and pointing to our resources of which there are legion.
Below is a wiring schematic for a magneto equipped Cub with Generator, Cut-out, Lights, Starter and a Battery.
As you can see in the parts breakdown above, the coil is contained inside the square cover.
McCormick Farmall Cub Operator's Manual 5-1-49 will work nicely for the '48's, GSS-1012 Electrical Equipment - for the Magneto trouble shooting and of course this one which is all you wanted to know about Magnetos - GSS-5035 Service Manual Magnetos.
Grab a coffee, a comfy chair and spend some time reading the links above and the ones below:
to Farmallcub.com Forum Family. And you have come to the right place for all things Cub related. If you click on the Site Rules, Regulations, & Important Information, it will point you to the Welcome Wagon wherein you will find links to many useful sites and topics. One of which is the Cub Manual Server. Enjoy!.
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
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- Team Cub Mentor
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Re: magneto
when you push the switch in on a mag it puts a ground in the circuit shutting the spark down from it. I think that there is a short in the wiring between the wire going to the mag and a wire carrying voltage. Find the short before going much further. I have never been able to check the coil with a volt meter. You can however use an external coil. A mag coil can be found on ebay for about 60 dollars.
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48 Leader "D" unrestored
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Re: magneto
Obviously, you'll need to check out the wiring to see what the smoking was all about, but if it has been miswired and voltage was applied to the mag kill stud it may have overheated the return spring on your points. That's a dead short in this case. I encountered that twice in one day! At first, I couldn't figure out what could do that to the points. I replaced the points and handed the mag back to the owner. He installed it and when checked it had no spark, again. When I pulled it back apart and found the same problem again, I went out to the tractor for a look. Sure enough, it had been wired for an external coil. I told him not to hook up the kill wire, it started right up this time. I don't think your coil would be damaged from this.
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Re: magneto
Someone could have put the wrong kill switch on it. You need a single wire switch.
Dale
"It's better to regret the things you've done than the things you didn't do."
Still can't help to think "Wish I hadn't of done that!"
"It's better to regret the things you've done than the things you didn't do."
Still can't help to think "Wish I hadn't of done that!"
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1948 Cub "Ellie-Mae"
1968 Cub Lo-Boy
Dad's Putt-Putt
IH 129 CC
McCormick 100 Manure Spreader
McCormick 100-H Manure Spreader
Post Hole Digger
M-H #1 Potato Digger - Circle of Safety: Y
- Twitter ID: Rudi Saueracker, SSM
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Re: magneto
Was checking my searches and came across an original '48 Owner's Manual
International McCormick Farmall Cub Tractor Operators Manual #1004120R2 48. Pretty reasonable and it is in good shape. Would be a good investment. Would recommend also that you acquire a Parts Catalog and some of the individual service manuals or the GSS-1411 which is the combined service manual.
Oh yeah and this is the kill switch that you need that is stocked by one of our sponsors - TM Tractor - magneto ignition switch, 54207DB
This is the style available on 54207DB Farmall Ignition Switch Push Pull Cub. This one has a better price - Magneto switch for Farmall Cub
International McCormick Farmall Cub Tractor Operators Manual #1004120R2 48. Pretty reasonable and it is in good shape. Would be a good investment. Would recommend also that you acquire a Parts Catalog and some of the individual service manuals or the GSS-1411 which is the combined service manual.
Oh yeah and this is the kill switch that you need that is stocked by one of our sponsors - TM Tractor - magneto ignition switch, 54207DB
This is the style available on 54207DB Farmall Ignition Switch Push Pull Cub. This one has a better price - Magneto switch for Farmall Cub
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
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Re: magneto
Battery connected, kill switch wire disconnected at magneto. Multimeter, voltage setting, test for voltage between end of kill switch wire and ground.cub-oregon wrote:I unhooked the battery to stop the meltdown. I also unhooked the kill switch from the mag post.
If you find voltage in one of the switch positions - wrong switch for magneto and tractor wired for battery powered ignition system.
Agree with Gary, most likely a short caused the magneto points to fault.
I have an excuse. CRS.
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1948 Farmall Cub - Hydraulic
1948 Ford 8N
Re: magneto
Thanks to everyone for help on this issue. It was indeed the points spring as mentioned by Gary Dotson. Once I fixed that problem, the tractor started right up. I will continue to work on the electrical wiring for the lights, ameter and generator. The schematic is very useful although my tractor is negative ground, not positive. I still have one dead magneto that belongs to my other tractor. I will keep at it.
I have been struggling with this issue for 2 weeks taking stabs in the dark.. Thanks to this great resource and the help of people who know about cubs, I was successful. Thanks again for the help. We will talk some more.
I have been struggling with this issue for 2 weeks taking stabs in the dark.. Thanks to this great resource and the help of people who know about cubs, I was successful. Thanks again for the help. We will talk some more.
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- Team Cub Mentor
- Posts: 5653
- Joined: Thu Aug 03, 2006 6:20 am
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53 Cockshutt 20 restored (Shooter)
52 Cockshutt 20 unrestored
47 Leader "B" (Herckie)
49 Leader "D" (Princess)
49 Leader "D" very rough
48 Leader "D" unrestored
Kubota B6200E
Kubota B6200HST
Kubota B8200HST-D - Circle of Safety: Y
- Location: OH West Mansfield
Re: magneto
I'm glad I was able to help you on this! It seems kinda odd that it will kill the spring, rather than frying the contacts, but that's what it seems to do.
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- 10+ Years
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- Joined: Fri Mar 01, 2013 10:29 pm
- Zip Code: 97702
- Tractors Owned: 1948 Farmall Cub - Manual lift
1948 Farmall Cub - Hydraulic
1948 Ford 8N
Re: magneto
One magneto was still not working. To test the coil, I put in the coil from the working magneto into the one that did not work. To my surprise, it worked. So it was a bad coil in the second magneto that kept it from working. I purchased a new coil on e-bay and received it yesterday. It has now been installed and the magneto ready for installation. I will perform the final test this weekend to see if I can get my second cub to run. The carb has been rebuilt and new plug wires are ready to go. I am hopeful that this cub that has been sitting in a field for years will come back to life.
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- 10+ Years
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Re: magneto
WELCOME CUB-OREGON
YOU CAN GET A MOMENTARY TOGGLE SWITCH AT A AUTO-PARTS STORE
FOR 2 (+/-) BUCKS AND THAT WILL WORK FOR THE KILL SWITCH-----
( GROUND ONE SIDE AND MAG. WIRE ON OTHER SIDE )---- NO HOT WIRES------
GOOD LUCK
LOMBARD-----SC----
YOU CAN GET A MOMENTARY TOGGLE SWITCH AT A AUTO-PARTS STORE
FOR 2 (+/-) BUCKS AND THAT WILL WORK FOR THE KILL SWITCH-----
( GROUND ONE SIDE AND MAG. WIRE ON OTHER SIDE )---- NO HOT WIRES------
GOOD LUCK
LOMBARD-----SC----
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