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Tractor Talk Discussion Forum

Resistor on JD 50

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Bruster

11-22-2004 12:03:43




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Anyone want to tell me why Deere put a resistor in between the ignition and the coil? Maybe to increase condensor life? My dad pulled one off his and found it started better, ( the resistor coils were bad and voltagevaried from .46 to 9.78 VDC ) he said Ford did the same thing to the N series.




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Joe MD

11-24-2004 07:59:53




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 Re: Resistor on JD 50 in reply to Bruster, 11-22-2004 12:03:43  
I was under the impression of what both buickanddeere and Earl S. said.

You need the ballast resister to allow full power under start up, but if you run at full voltage you'll burn up your points.



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buickanddeere

11-22-2004 13:24:29




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 varying voltage Re: Resistor on JD 50 in reply to Bruster, 11-22-2004 12:03:43  
The voltage will vary with across the ballast depending on the current through the ballast. No current= no voltage drop across it when the points are open. 9.78 volts on the ballast output when the points are closed suggests a 3.0 ohm coil is already on there.



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buickanddeere

11-22-2004 13:21:15




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 Re: Resistor on JD 50 in reply to Bruster, 11-22-2004 12:03:43  
Most people never read the wiring diagram and did not know a gas/all-fuel 50 used no ballast resisitor from the factory and a 3.0ohm 12V coil. The ballast resisitor and a 1.5 ohm 6V coil gets used on a 12V system with bypass starting. When cranking a temporary switch closes and applies full battery voltage to the coil thus bypassing the ballast. The idea is to still have a strong spark even when the electrical system voltage is dragged down while cranking. In a word, hurl the ballast and install a 3.0 ohm coil. It may even have a 12V/3.0 ohm coil already on there. Or update the mechanical starter switch to the one with the bypass switch. And wire in the bypass starting circuit.

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Earl S.

11-22-2004 12:28:52




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 Re: Resistor on JD 50 in reply to Bruster, 11-22-2004 12:03:43  
You will need a coil with internal resistor or it will smoke the points.John T. can set you straight over on the Deere forum. Earl



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