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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

Re: Ih460 wiring ,coil question

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John T

01-30-2013 06:21:16
71.52.103.159



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If a coil is labeled "12 Volts" or "12 Volts NOT for use with Ballast Resistor" or "12 Volts NO Ballast Required" etc on a 12 volt tractor YOU DO NOTTTTTTTTTT USE A BALLAST OR THE SPARK WOULD BE VERY WEAK....

If a coil is labeled "6 Volts" or "12 Volts for use with Ballast Resistor" or "12 Volts requires Ballast" etc on a 12 volt tractor YOU NEED AN EXTERNAL SERIES VOLTAGE DROPPING (12 to 6) BALLAST or else the coil overheats and the points burn rapidly.

Om many 12 volt tractors a 6 volt coil plus an external ballast is used so during cranking the ballast can be bypassed (like an extra I terminal on starter solenoid etc to feed coil direct bypassing ballast while starter is engaged) which helps cold weather starting.

If your ballast was by passed someone likely put on a 12 volt coil (instead of correct 6) and did away with the by pass circuit. It will still work okay as is with poorer starting spark in cold weather as if wired correctly with 6 volt coil and solenoid by pass

Contrary to what many lay persons believe, you most likely will NOT find any discrete stand alone "resistor" hidden away inside the coil can. A 12 volt coil has around 2.5 to under 4 ohms primary resistance while a 6 volt coil has more like 1.25 to 2 ohms

Myself and Bob M and Janicholson have explained this hundreds of times on here do a search for more info if needed

That help?? Any more questions?? See URL link below for more

John T

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LarryNMO

01-30-2013 18:15:38
99.195.117.176



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 Re: Ih460 wiring ,coil question in reply to John T, 01-30-2013 06:21:16  
John T, I read all your info on coils. So I had a little time this evening to go out to the tractor shed and look at the wiring again. Haven't had much time to work on it lately. When looking at the coil it wasn't stamped 6volts or 12 that I could see, very rusty and old looking (like me). I did see some wording that said,use with external resistor and there was a #27291 stamped on it. Since the tractor has 12volt system should i ask for a 6volt or 12volt coil to install on it? Thanks Larry

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John T

01-30-2013 19:22:25
71.52.103.159



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 Re: Ih460 wiring ,coil question in reply to LarryNMO, 01-30-2013 18:15:38  
"I did see some wording that said, use with external resistor"

If it says that my best "guess" is it means just what it says i.e. it requires the resistor or else it will overheat....Id try that coil WITH the unshunted external ballast n see what happens.

"Since the tractor has 12 volt system should I ask for a 6 volt or 12 volt coil to install on it?"

You can EITHER use a 6 volt coil PLUS the external series voltage dropping (12 to 6) working ballast orrrrrrrrrrrr a 12 volt coil with no ballast required. However to utilize the ballast by pass system for improved cold starting you would need the 6 volt coil plus a good ballast. Id be tempted to just use a new full 12 volt coil (NO ballast required) and do away with any ballast or by pass circuit headaches...

John T

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LarryNMO

01-30-2013 07:31:21
75.121.10.150



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 Re: Ih460 wiring ,coil question in reply to John T, 01-30-2013 06:21:16  
Thanks John T for the info. I'm a shade tree mechanic (I think) with limited electrical expertise, but maybe I can digest all this info.



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The tractor vet

01-30-2013 07:15:59
75.19.126.114



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 Re: Ih460 wiring ,coil question in reply to John T, 01-30-2013 06:21:16  
The stock Coil for a Farmall is a 6 volt coil and the use of a resistor is used from the factory , on late model 706-806 the ceramic resistor was replaced with a resistor wire . A hot shot wire as i cll it was run from the R terminal on the solenoid to bypass the resistor to give a shot of 12 volts for fast start and hot spark. Now i am not and electrical engineer and maybe my way of doing something are shell we say barnyard engineering i try and follow the book with a few teaks here and there like i do away with the fuse and use self resetting curcit brakers add in C/V relays to take the load off the head light switch when someone want to add more lights then came from the factory since you pushing the factory switch to the max at five lights . I cringe at some of gen to alt. change overs that i have seen , Like running a 65 amp alt thru a 12 ga. wire and like the Farmer wire job that was hacked up on this 460 i am working on at this time . How these guys can sleep at night with something like this setting in a barn full of hay and fifty or so cows down below is unbelievable .

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LarryNMO

01-31-2013 18:07:48
75.121.9.42



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 Re: Ih460 wiring ,coil question in reply to The tractor vet, 01-30-2013 07:15:59  
Tractor Vet, (I'm getting my electrical course on this webb site THANKS TO ALL FOR THE HELP) you indicated someone had installed a 65 amp alt with a 12 ga. wire on a tractor (not good). So I thought I better ask you. On my ih460 the alt was bad, had it tested. The alt had come off a 73 chev pu, it was marked what it came off by someone. Soooooooo I had one that came off a 75 pontiac 400cu in. that tested good and put it on the tractor. Now i do not know what amps it is pushing thru the wires and what size alt would that tractor use? DON"T WANT TO BURN DOWN THE SHED Larry

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John T

01-30-2013 15:37:14
71.52.103.159



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 Re: Ih460 wiring ,coil question in reply to The tractor vet, 01-30-2013 07:15:59  
Thanks for the info,I know many 12 volt tractors use the 6 volt coil and the ballast by pass while cranking, but I had no idea WHICH MODELS. The R or I (what Fords used) terminal on the starter solenoid is a terminal thats hot ONLY while the starter is engaged and it connects direct to the coil input so it sees unballasted battery voltage ONLY while cranking fOR TH hotter starting spark, its a good system if all is well...

Fun chat

John T

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