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Coil theory vs reality

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rob

04-20-2000 12:46:07




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Great posts on coil theory but maybe one of the experts can tell us layman the correct way to wire one up? I have a 4020 JD with neg ground, electronic dist, 55k coil , and a ballast resistor. How does one wire this correctly? 12v hot to ballast restistor to (+ or -) on coil then from (+ or -) on coil to distributor ? Thanks!




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John T Electrical Engineer (Hey Dave ?)

04-20-2000 14:29:18




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 Re: Coil theory vs reality in reply to rob, 04-20-2000 12:46:07  
My friend Dave there, who has probably worked on more John Deeres then I ever even seen, is absolutley correct. However, if you read my Coil Polarity Revisited post below and my Respectfully Disagrees comment, you will see more about coils than you may want to ever know. Hey Dave, do you agree with me that the coils high voltage lead is NOT connected to the coils case as my fellow engineer argues??? Please read my post, his reply, and my dissent, because although you may not be an engineer, as far as Im concerned, youre the MAN on these JD bulletin boards. Ol John T

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Dave Wickman

04-22-2000 07:14:41




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 Re: Re: Coil theory vs reality in reply to John T Electrical Engineer (Hey Dave ?), 04-20-2000 14:29:18  
Hey John T., The way I understand the way ignition coils are wound inside is the same way I interpret your explanation. I see it like buckeye al described it with the two springs. I always thought the two winding inside the coils were hooked together in a series circuit and the end of the series or secondary coil is connected to the high tension lead terminal. The two primary terminals on the coil where the primary wires hook are: 1. The beginning of the primary coil winding or series and 2. The other primary terminal is the end of the primary winding and the beginning of the secondary winding or the middle of the series circuit of the two coils. I always have checked the continuity of the winding with an ohm meter and if I ever found resistance to the case or to ground I pitched it, because a new coil is not that way. I may be wrong and I welcome your input as always, Respectfully, Dave W.

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Dave Wickman

04-20-2000 14:04:40




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 Re: Coil theory vs reality in reply to rob, 04-20-2000 12:46:07  
rod, Never claimed to be an expert, Not even an Engineer, Hell I am just a dumb ass Iowa farm boy with a High school diploma. But I think I can answer your question!! If you have a negative ground system as you described you will take the power from your ballast resistor to the + side of the coil, which leaves the negative terminal of the coil to the distributor. Rule of thumb for igniton coil polarity is Negative ground Negative to the distributor Positive ground Positive to the Distributor. Hope this will answer your question, as Paul Harvey would say, Good Day

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jess

04-20-2000 13:08:38




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 Re: Coil theory vs reality in reply to rob, 04-20-2000 12:46:07  
great info. an even better question lets put it in english so we can all undrstand



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RonMC

04-20-2000 18:49:02




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 Re: Re: Coil theory vs reality in reply to jess, 04-20-2000 13:08:38  
I think what he's saying, is the points perform the grounding, therefore, whichever ground you have, that's the terminal that goes to the points.



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