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Farmall & IHC Tractors Discussion Forum
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460 wiring

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fred

10-29-2003 18:13:49




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The 460 Im trying to get running doesnt have a coil or alternator. I intend to put a delco alternaor on it with built in regulator. What type of coil do I need (6v or 12v)? There is a broken ballast resistor next to where the coil was. On a 12 volt system what was the purpose of the resistor? Do I still need one after I put the new alternator & a 12 volt coil on? Thanks




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Gary in MOOzarks

10-30-2003 03:06:04




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 Re: 460 wiring in reply to fred, 10-29-2003 18:13:49  
Looks like you are getting lots of advise which is good, but can be just as confusing. What most of these fellows is true, it just depends on how you want to go about it. Running 12v through your coil gives a hot spark but its hard on points which is why they ran them at 6 volts nominal with 12 volts at startup. The older setups used an 6 volt coil with an external resistor, which was simple. When the switch was in start mode it ran 12 volts to the coil and in the run mode it ran 6-8 volts. Later they built coils that had an internal resistor and didn't use the ceramic resistor. like the one fellow said. Read the outside of the coil. They often say 12v external or something like that. Which means it's a 6volt coil for a 12 volt system. As far as the altenator goes, alot of folks use the one wire system which is easy to hook up but they are a bit more pricey. I generally use the 3 wire variety which are readily available and cheap. It does require a small light bulb like a running ligt or turn signal bulb to excite the altenator but that ends up on the dash as an indicator that its working when you start up the light glows and when the altenator is charging it goes out. If i did it right there will be a link to a conversion site that has a diagram good luck

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Red Man

10-29-2003 19:54:26




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 Re: 460 wiring in reply to fred, 10-29-2003 18:13:49  
A 460 gas was 12 volt from the factory.



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Adam

10-29-2003 18:18:23




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 Re: 460 wiring in reply to fred, 10-29-2003 18:13:49  
Go with the Delco 10si, no question there. That will mean you have to convert to 12v system, battery, bulbs, guages (or resistors), and new 12v coil. Get a coil that says no external resister needed and you can eliminate the extra ballast resister.

ABW



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fred

10-29-2003 18:24:07




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 Re: Re: 460 wiring in reply to Adam, 10-29-2003 18:18:23  
Thanks. I believe it has always been a 12 volt system, that was why I didnt understand the resistor. Where is the best place to get a coil? Dealer or is there an automotive coil that will work?



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Adam

10-29-2003 18:26:04




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 Re: Re: Re: 460 wiring in reply to fred, 10-29-2003 18:24:07  
Cant go wrong at NAPA. All the coils I have seen say on the side if ther require an external resister or not. So if you go junking, just try to read the side of the coil.

ABW



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ken

10-29-2003 18:33:30




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 Re: Re: Re: Re: 460 wiring in reply to Adam, 10-29-2003 18:26:04  
the purpose of the ballast resistor is to cut down voltage to the coil when running to like 7-8 volts.when you start you need to bypass the resistor to put a full 12 volts to the coil for a hotter spark. to do this there is 2 little terminals on the solenoid one is start and on is for the bypass wire to the coil.as you look at the solenoid from the back of the starter the little one on the right should be for start and the one on the left for bypass.

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Keith in OR

10-29-2003 19:17:43




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 Re: Re: Re: Re: Re: 460 wiring in reply to ken, 10-29-2003 18:33:30  
you are drawing the wrong conculsion about the ballist resistor, all it is, is a current source for the coil. the ballist resistor is only .5 ohms whish is not going to drop much voltage without a lot of current OHMS LAW V=IR. Use a ford coil, they all have internal resistance build in. This is what I use on all 6 to 12 volt conversion, which have been doing since the early 70's



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