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Farmall & IHC Tractors Discussion Forum
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Magneto cut-off switch

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WD-9

10-31-2004 06:19:58




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On the intake manifold of my WD-9 there is a wire hanging out, upon my limited research I think this is a "Magneto cut-off switch"

The tractor has no Magneto any more (it has been converted), it switches from gas to diesel with no problems.

Can I just remove this switch and plug the hole?

Thanks in advance for your time.




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Haas

10-31-2004 16:53:00




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 Re: Magneto cut-off switch in reply to WD-9, 10-31-2004 06:19:58  
Geoff is correct, but I'll make a few more comments. Since you say you have no magneto, I assure you have a battery ignition. The wire hanging out goes to a switch in a chamber at the front of the manifold. When you switch from gas to diesel, the changeover mechanism works that switch to ground the magneto and stop the spark to the plugs. The switch would work backwards for the battery ignition, as the switch is closed, grounding the magneto when in diesel mode and open to allow spark in gas mode. Thus it won't work for the battery ignition. Some later gas start diesels had battery ignitions and I assume they had a similar switch to work with the battery ignition. Maybe you could try to locate one of those and hook it up like it is supposed to be. The battery ignition switch would require two wires, one from the battery and the other to the coil. As Geoff said, you should shut off your ignition when in diesel mode to stop sparks to the plugs. The only reason for plugging the hole would be to keep out the mud daubers and other insects. If you want to plug it, a little dab of silicone putty should do the trick.

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Geoff NY

10-31-2004 16:11:36




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 Re: Magneto cut-off switch in reply to WD-9, 10-31-2004 06:19:58  
You say your 9 doesn"t have a mag, so I have to assume it now has a distributer. If so you should have a manifold with a contact switch for a distributer. In either case the switch stopped power from going to the spark plugs when in the diesel mode. If you want to leave it alone, just make sure you turn your key switch (or whatever sends power to your distributer) when your in the diesel mode. No real need to plug the hole. Geoff

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