Farmall 140 1976-1977

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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fitzchavis
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Tractors Owned: 1965 International 140
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Farmall 140 1976-1977

Postby fitzchavis » Mon Feb 07, 2022 8:54 am

I have a farmall tractor with a serial number that falls between 1976 & 1977. What necessitates the requirement to install an inline ceramic resister at the coil? Currently, it does not have one? If anyone can give me direction I will appreciate it. Thanks.

Gary Dotson
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Re: Farmall 140 1976-1977

Postby Gary Dotson » Mon Feb 07, 2022 9:10 am

As originally equipped from the factory, your tractor would have had an internally resisted coil, no resister would have been installed. You will only need a resister if someone has installed either a 12 external resister coil or a 6 volt coil. Replacement coils are generally marked with that info. If, for some reason, you are concerned about this, you can always disconnect the wire and check it with an ohm meter, the proper coil will be in the neighborhood of 3 ohms.

fitzchavis
Posts: 22
Joined: Tue Mar 30, 2021 1:36 pm
Zip Code: 28364
Tractors Owned: 1965 International 140
1970 International 140
184 Cub Planter
Cole Planter

Re: Farmall 140 1976-1977

Postby fitzchavis » Mon Feb 07, 2022 9:34 am

Gary Dotson wrote:As originally equipped from the factory, your tractor would have had an internally resisted coil, no resister would have been installed. You will only need a resister if someone has installed either a 12 external resister coil or a 6 volt coil. Replacement coils are generally marked with that info. If, for some reason, you are concerned about this, you can always disconnect the wire and check it with an ohm meter, the proper coil will be in the neighborhood of 3 ohms.


What reading should I get if there's no internal resistor inside the coil?

Dave F.
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Re: Farmall 140 1976-1977

Postby Dave F. » Mon Feb 07, 2022 10:48 pm

Most likely 1 ohm to 1.5 ohms from what I learned about coils. The 12volt coils that require a resistor should measure 1-1.5 ohms And the internal resisted 12v coils measure 3-ohms and 6volt coils measure 1-1.5 ohms so I would think you could use a non internal resisted 12 volt coil on a 6 volt. system providing the coil measures 1-1.5 ohms Dave F.

Gary Dotson
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Posts: 4907
Joined: Thu Aug 03, 2006 6:20 am
Zip Code: 43358
Tractors Owned: 48 Cub Diesel (Cubota)
53 Cockshutt 20 restored (Shooter)
52 Cockshutt 20 unrestored
47 Leader "B" (Herckie)
49 Leader "D" (Princess)
49 Leader "D" very rough
48 Leader "D" unrestored
Kubota B6200E
Kubota B6200HST
Kubota B8200HST-D
Circle of Safety: Y
Location: OH West Mansfield

Re: Farmall 140 1976-1977

Postby Gary Dotson » Tue Feb 08, 2022 8:41 am

That’s correct, Dave. A 12 volt external resister coil is merely a 6 volt coil in disguise. I usually see 1.3 - 1.5 ohms on them.


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