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Ignition switch resistor

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jeff ruth

05-30-2000 20:32:50




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my 3010 has a resistor on the ignition switch. If I understand the service manual right this resistor is part of the run circuit and not the start circuit. Why does this resistor keep burning out. Over the last two years I have replaced four or five switches.




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clooney

05-31-2000 18:19:45




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 Re: ignition switch resistor in reply to jeff ruth, 05-30-2000 20:32:50  
Jeff, if you have the correct ignition coil & charging system voltage those resistors in the ign. s/w are probably failing due to vibration. When those resistors are working they get very hot & due to vibration & heat they can either sag & touch a metalic abject to short out, or just plain fatigue and break. I'm not familiar with how those resistors are installed in the ignition s/w, but if you can replace the resistor in the ignition s/w with an external mounted "ballast resistor" & run a wire from each end of the resistor to the terminals where the orininal resistor was attached in the s/w you will be farther ahead. I don't think you can just put the "ballast resistor" in the wire going to the coil because you will loose your "by-pass" starting function. you can obtain a "ballast resistor" from your local auto parts store, they probably even know which one you need.

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John T

05-31-2000 10:18:10




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 Re: ignition switch resistor in reply to jeff ruth, 05-30-2000 20:32:50  
Jeff, if it keeps burning out prematurely, I suspect the coil may be bad or maybe not the correct one. That resistor is in series with the coils low voltage primary winding and points and reduces voltage across and current through the coil. I have seen some tractors in which that resistor is no longer used and replaced with a wirewound bakelite unit that seems to dissipate heat better and seldom fails. Ol John T

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jeff ruth

05-31-2000 13:12:40




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 Re: Re: ignition switch resistor in reply to John T, 05-31-2000 10:18:10  
What is this wirewound bakelite unit? Is this more like a regular electrical resistor that you get from an electronic supply place? Is it a JD product?where do I find it?
Thanks



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zane

05-31-2000 17:48:41




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 Re: Re: Re: ignition switch resistor in reply to jeff ruth, 05-31-2000 13:12:40  
Jeff: It's wire wound filament style, mounted on a bakelite or porclain base. They're capable of being mounted most anywhere. Ask for one at an auto parts store. Tell'um you want one for a typical 12 volt system with mechanical (contact point) ignition.

These gizmos serve only to drop the operating current load on the ignition coil/contact points--to keep them from burning out early.



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ret

05-31-2000 18:54:03




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 Re: Re: Re: Re: ignition switch resistor in reply to zane, 05-31-2000 17:48:41  
Just got done with a resister problem. Here in Va I had no luck at auto parts stores. The friendly guys in the JD dealership in Culpeper ordered me one from rheir book. It sure saved buying a new switch Good luck



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