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How Do I Determine If Coil Is 12V or 6V?

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Robb - Va.

04-14-2002 17:17:01




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Hey Guys,
I posted here yesterday about my friend's 9N/2N, thanks for the replies. Between them and some 'net research, I'm pretty sure I know more about my buddy's tractor than he does. So I'm coming up with a way to permanantly fix his ballast frying problem, when he gives me a call. He tells me he was looking around the barn and found a box with his original stuff in it from the 12V convertion. In it is a coil, we assume the original 6V (front mount, by the way) coil. So the question becomes, what is on it now? How do I determine if the coil that is on the tractor is a 12V or 6V?
Thanks in advance for any help,
Robb

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Dell (WA)

04-14-2002 23:04:50




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 Re: How Do I Determine If Coil Is 12V or 6V? in reply to Robb - Va., 04-14-2002 17:17:01  
Robb..... ....it pleases me that you've shown initiative and did some research in the "archives" about your friends frontmount 12 volt conversion. As one member sez: there are many ways to convert to 12 volts and some of them even work.

The simple test to differentiate between 6 or 12 volt frontmount ignition coil is with an ohm meter. Realize ohm meters are not very accurate at low resistances like the ignition coil primarys so the exact ohm value is not that important.

If you understant that concept, then a good 6 volt frontmount ignition coil will read about 1 ohm resistance. A good 12 volt frontmount ignition coil will read about 3 ohms. About a factor of 3 difference.

The secondary for both coils will read about 5000 to 10000 ohms, a very major difference from the primary.

If you choose to use the modern 12 volt frontmount ignition coil, (which I recommend), you STILL must have a current limiting resistor of 1/2 ohm 10 watts from radio shack to keep from burning out your new 12 volt coil. DO NOT USE the original OEM ballast resistor with the 12 volt coil. It is the WRONG value resistance by a factor of 3. Do you under stand that? ..... ..... respectfully, Dell

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Thanks Dell, Robb-Va.

04-15-2002 15:40:54




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 Re: Re: How Do I Determine If Coil Is 12V or 6V? in reply to Dell (WA), 04-14-2002 23:04:50  
Dell, I understand completely. I agree with your opinion about meters at low resistance. I carry 3 meters in my toolbag, and usually measure with at least 2 at low OHM. I love to say that I'm set, and tractor will be running as soon as I get a little while, but that is probably a lie.
I'll keep fingers crossed,
Robb



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