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Farmall & IHC Tractors Discussion Forum
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h-4 magneto help???

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t.r.y.

01-26-2006 16:08:28




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I don't have any spark. I tried testing to make sure there where no grounds, Positive ground system. With a test light on the neg. terminal I my light came on when I hit any ground and at condenser housing and at condenser terminal and the wires inside going to the points which the light also came on when I touched either side of the points. ?? I think it maybe be something shorted to ground. ANy help would be appreciated.

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El Toro

01-26-2006 16:42:25




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 Re: h-4 magneto help??? in reply to t.r.y., 01-26-2006 16:08:28  
As Bob has mentioned, the battery only furnishes
voltage to your starter & Lights if you have them.
A magneto creates its own voltage from the coil when the magnets pass over the coil.

Disconnect any grounding wire for the time being
from the mag. Clean those points with swabs dipped in alcohol and set them to .013". Watch the impulse coupling to see if is snapping when cranking the engine. If you still have no fire
pull the cover over the coil and use a flat blade screwdriver to see if the magnets still have good magnetism. It should quickly pull that screwdriver to it. Hal
PS: It could have a weak coil too.

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Bob

01-26-2006 16:15:24




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 Re: h-4 magneto help??? in reply to t.r.y., 01-26-2006 16:08:28  
Your magneto DOESN'T care what ground polarity the tractor is, and should not even be connected to the tractor's electrical system. (Unless someone has "gutted' it out, and added a coil, making a distributor out of it.)

With the "kill" wire disconnected from the magneto, it should spark when the engine is cranked.

All the kill wire does is short the mag to ground when you want to stop the engine.

If you are feeding battery power into an original magento, you'll "kill" it!

Cut and paste the link below for a factory manual for the mag:

http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-5035%20Service%20Manual%20Magnetos/index.html

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