Farmall h weak spark

Brady Miller · Jan 18, 2014

Gents,

I showed my dad the spark on the mag and we think it's weak and it seems to miss a spark ever once in a while.

All gaps are good timing good everything spot on. What about replacement parts?

El Toro · Jan 18, 2014

Your coil or the mag's magnets may be getting weak causing the weak spark. I would first check the magnets by touching them with a flat blade screwdriver. They should attract the screwdriver with a good bit of effort. If they have strong magnetism I would replace the coil. Be sure to check your point gap should be .013" also clean the points with some 320 wet or dry until shiny. Hal

Janicholson · Jan 18, 2014

See my comment on the original post. Do you have the picture of the external coil converted mag? Jim

teddy52food · Jan 18, 2014

Check your E-Mail.

Brady Miller · Jan 18, 2014

Is the magnet the cylindrical piece going through the coil or the sides where the coil screws to? I haven't worked on mags much.

If someone could briefly explain or point me to a video or something on how the mag works. Thanks

Brady Miller · Jan 18, 2014

Jim,

No I do not have that picture. can you send me one?

Janicholson · Jan 18, 2014

It is El Toro"s Picture. I found one of the examples of where it was posted here, but it is "moved". Lets hope El Toro reads this and reinserts it into parts and Pieces or somewhere to look at it. THe image shows the mag with a coil and wiring mounted to the outside. (the image also shows a ballast resistor which you would not need). Jim

teddy52food · Jan 19, 2014

The magnet is on the shaft running through the mag. The impulse driving it is on one end. The mag has to be disassembled to get it out. If you take it out, get 2 curved pieces of iron on each side to act as a keeper or it may lose some strength.

El Toro · Jan 19, 2014

Here's a picture of a H4 mag converted to a distributor. You use the points in the mag and disconnect the coil wire from mag's points. Battery voltage needs to be run to an ignition switch, to an auto type coil and to the points in the mag. If you're still using the 6 volt battery with positive ground you run the hot wire to + terminal on the coil and a wire from the neg
terminal on the coil to your points. Hal

Janicholson · Jan 19, 2014

Please find the picture above in El Toro's response to me near the current top of page.
The ballast resistor (grey diagonal item) is not needed as yours is 6v, his was 12v with a 6v coil. Jim

El Toro · Jan 20, 2014

I told you the wrong way to wire your auto type coil if you decide to install one. If your battery is 6 volt and has the + terminal grounded your + terminal on the coil is wired to your points. Hal

Farmall h weak spark

Brady Miller

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El Toro

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Janicholson

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teddy52food

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Brady Miller

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Brady Miller

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Janicholson

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teddy52food

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El Toro

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Janicholson

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El Toro

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