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VAC ignition coil

L

Lee_K

Member
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
 
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.
 
(quoted from post at 21:18:06 03/12/19) 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.
Click to expand...


" 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?
 
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
 
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.
 
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
 
(quoted from post at 05:19:55 03/13/19) 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
Click to expand...

"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!
 
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.
 
(quoted from post at 10:09:17 03/13/19) 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.
Click to expand...

THANKS for catching that, Jesse!

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