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Case Tractors Discussion Forum
:

VAC ignition coil

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Lee_k

03-12-2019 18:43:34




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The coil on my 1950 VAC went out this weekend. I got it running again using a coil from a small block Chevy. My question is will this work long term or is there a specific coil that tractor should have?

Thanks
Lee




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Bob

03-13-2019 08:15:37




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
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THANKS for catching that, Jesse!

I missed the surprise revelation of the 12 Volt conversion that was not mentioned initially!



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JMOR

03-13-2019 08:09:17




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
With Lee's late/new revelation, " Yes my VAC has been converted to 12v. I was under the understanding that chevy used a resistor wire from the ignition switch. Will I need a ballast resistor in place of this? ", Lee needs to ignore all the previous posts and get himself a resistor of about 1.3 Ohms.



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Bob

03-13-2019 03:47:11




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
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"old" and I, with a combined post total of 131,531 posts both say you don't.

"ktf", with 988 posts, says "you probably do".

Chose wisely!



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Lee_K

03-13-2019 03:19:55




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
The coil was from a 1964 283 although I assume not the original coil. Yes my VAC has been converted to 12v. I was under the understanding that chevy used a resistor wire from the ignition switch. Will I need a ballast resistor in place of this?

Thanks,
Lee



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old

03-12-2019 21:09:11




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
Had that happen on my ford 841S years ago and used a coil off a Chevy 250 straight 6 on it and it is still there today. No ballast resister but with out doing the ohm test one never knows if it is a true 6 or 1 volt coil



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Bob

03-12-2019 19:39:49




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
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" if your VAC is 6 volt and your Chevy 12 volt you probably need a resistor in front of the coil

HUH?

HOW would a resistor help a 12 Volt coil function in a 6 Volt system?



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kevinthefixer

03-12-2019 19:18:06




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 Re: VAC ignition coil in reply to Lee_k, 03-12-2019 18:43:34  
Lee, if your VAC is 6 volt and your Chevy 12 volt you probably need a resistor in front of the coil. I assume the Chevy was old enough to have an external coil? Did it have a resistor with it? I can't remember where Chevy put them because they didn't have as much trouble with them as Chrysler did. Theirs were on the firewall.



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old

03-12-2019 21:12:17




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 Re: VAC ignition coil in reply to kevinthefixer, 03-12-2019 19:18:06  
Your thinking is backwards. a true 6 volt coil need a resister but a true 12 volt coil does not. So if 6 volts and it is a 12 volt coil adding a resister will make I not run for sure.



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kevinthefixer

03-13-2019 06:19:13




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 Re: VAC ignition coil in reply to old, 03-12-2019 21:12:17  
Old, you're right of course, that's what I get for trying to think when I'm tired.



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