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Burned out coil after conversion

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old fart

04-06-2001 10:55:15




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I just finnished my 12v. conversion on my 9n,including a ballast resistor,metered at the 6v coil input terminal ( 7 volts dc.) got called away for 20 mins. came back to find the coil guts melted down and oozing out. ( Forgot to turn ignition off.) The diagram I followed just said to install a ballast resistor, didnt say if it should be in series with the original or in place of it so when I put it instead of and got 7v. I thought it was o.k. any suggestions guys..... .

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Andy - Hammond, LA

04-07-2001 07:49:33




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 Re: burned out coil after conversion in reply to old fart, 04-06-2001 10:55:15  
My .02 cents worth. When I replaced my 12V coil, I was specifically informed by "leaders" of this forum to install and use a ceramic resistor to bring the V down to an acceptable level. Keep in mind that the alternator will pump out variations of V levels in the 13.1-14.8 range and my aim was to hit the 12V coil with just under 12V - instead of hitting it too hot. I feel that this will make the coil last longer and prevent quicker burnouts.

Thanks,
Andy

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Jim

04-06-2001 12:24:22




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 Re: burned out coil after conversion in reply to old fart, 04-06-2001 10:55:15  
This is what I used and it work ok.
Go to tractorlinkes.com on left of page.
Then ford. then brians 12 volt conversion page.
Make shue you use the 194 or 194 lite in it and that stops burning up coil when you leave switch on.
Hope this helps you it did me.

JIM IN AZ



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Danny in CO

04-06-2001 11:55:04




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 Re: burned out coil after conversion in reply to old fart, 04-06-2001 10:55:15  
The voltage at the coil is dependent on whether the points are closed or open. Since you said you had 7 volts at the coil, I assume the points were closed. If the points were open, you would have had battery voltage. If the points were closed, 7 volts is TOO much for a 6 volt coil. It should be about 3.5 volts with the points closed and battery voltage with the points open.

Since you have burned up the coil, I would now get a 12 volt coil as the replacement. If I rememeber correctly, 7 volts with the points closed is about right for a 12 volt coil.

My $.02 worth,
Danny

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Terry

04-06-2001 11:38:09




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 Re: burned out coil after conversion in reply to old fart, 04-06-2001 10:55:15  
First you should never ever leave the ignition on without the tractor running, you will have to check the points as you may have also burnt these as well. now would be a good time to put a 12 volt coil on they are only a couple bucks more and you will save a lot of head aches later. If you use a 12 volt coil you need to get a resistor for a 12 volt system in place of the one you have now. To answer your original question,I have seen this addressed a couple times on here you should be able to find it in the archives. good luck

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STUMP PULLER

04-06-2001 12:21:22




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 Re: Re: burned out coil after conversion in reply to Terry, 04-06-2001 11:38:09  
YOU CAN ALSO GET A REAL 12V COIL THAT DOES NOT REQUIRE A BALLAST RESISTOR. I HAVE ONE ON MY 8N THAT STARTS AND RUNS GREAT. THE REAL 12V COIL WILL MEASURE ABOUT 3.6 OHMS. GOOD LUCK



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old fart

04-06-2001 13:19:06




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 Re: Re: Re: burned out coil after conversion in reply to STUMP PULLER, 04-06-2001 12:21:22  
Many thanks for the info guys, hope you all had a good laugh at my foolishness, but I really like the old Ford 9N. and I have spent a lot of time and effort to bring her back to scratch. She was built in 1946 and this is her first major, I have rebuilt her from stem to stern so she should be good for another 50+ years. Probably outlast me.



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