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Harry Ferguson Tractors Discussion Forum
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burning out coils on fergy

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eggmannz

03-05-2007 00:16:13




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i have a 1954 fergy 24. it is a good runner. but after a half hour or so of runing the coil heats up and motor dies. i have just given her a birthday and overhauled the head, carby, new coil, plugs, points. she started up straight away. with a few minor adjustments running pretty good. but after a half hour or so she died again. coil was pretty hot to touch, she wouldnt start up again until the coil cooled down a bit. i was wondering if any one out there has a idea what the cause might be. i suspect a control box. many thanks. henk

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Jerry/MT

03-05-2007 07:50:17




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 Re: burning out coils on fergy in reply to eggmannz, 03-05-2007 00:16:13  
If you have a 6V coil and are running it in a 12 V system, the point current will be about double what it should be, causing it to overheat, melt the tar like insulation in the coil and short out. When it cools off,all is well for a half hour or so then it fails again. You can put a resistor in series with the coil to reduce the current but the best thing to do is to put a real 12 V coil in it. NAPA has them for about $15 ((Part Number IC-14 SB I believe).

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mike a. tenn.

03-05-2007 08:06:46




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 Re: burning out coils on fergy in reply to Jerry/MT, 03-05-2007 07:50:17  
hey jerry...i've always wondered about that. i have a resistor in mine, but by replacing the coil with a 12 volt, what happens to the points? wont they have too hot of a spark and burn out quickly? i was burning out points alot before i put the resistor in. would you have to change points? widen the gap? what about condenser?

?????mike



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Jerry/MT

03-05-2007 20:49:28




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 Re: burning out coils on fergy in reply to mike a. tenn., 03-05-2007 08:06:46  
Mike,
if you have a real 12V coil, the resistance is built into the coil. When you start cold the resistance is low, you get max point current and spark. When the reistor heats up, the resistance increases and the point current is reduced. (I believe its called a positive temperature coeficient resistor i.e dR/dT>0).This keeps your points from burning up. Point current is what causes your points to burn up not the voltage. If you have this type of resistor on your 6 volt coil, matched to your coil, you should have the same effect. If you have a fixed resistor (dR/dT=0), you're not getting the maximum spark when you cold start.

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Bob

03-05-2007 10:23:45




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 Re: burning out coils on fergy in reply to mike a. tenn., 03-05-2007 08:06:46  
Points don't care if the system 6 or 12-Volts.

Leave the point gap ALONE.

The condensor doesn't care about the voltage either 'cause it's rated in the 300 to 600 Volt range.

Condensor capacity (mfd's) can vary a bit from coil to coil (NOT a voltage thing) but is typically NOT an issue.



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glennster

03-05-2007 07:30:23




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 Re: burning out coils on fergy in reply to eggmannz, 03-05-2007 00:16:13  
check the battery side wire of the coil with a voltmeter, remove the wire from the coil when you check it. if it shows 12v, you got too much power for the coil , assuming its a 12v system. if there is a 12v coil in it, stop by napa, pick up a ballast resistor for an early 1970's b-body chrysler product, the part number is icr11, echlin line, it is a porcelain resistor, put the battery wire on one side, make a short wire to go from the other terminal to the coil. part will run you about $6.00.

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Robert Plyler

03-05-2007 06:32:22




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 Re: burning out coils on fergy in reply to eggmannz, 03-05-2007 00:16:13  
Has the tractor been converted to a 12 volt system. Sounds to me like you are using a 6volt coil on a 12volt system. A tag with the model number should be located just above the steering wheel if it is still there.Someone on this forum can tell you the year and series tractor you have by those numbers. Good luck



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mike a. tenn.

03-05-2007 02:47:03




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 Re: burning out coils on fergy in reply to eggmannz, 03-05-2007 00:16:13  
hank...you wrote you have a '54 fergie 24. i've never heard of one. did you mean a TO or TE-20? when you bought the new coil did you get a 6v or 12 volt coil and is your tractor still 6v or has it been converted to a 12v system? you might have the wrong coil??

-mike



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henk

03-11-2007 00:18:34




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 Re: burning out coils on fergy in reply to mike a. tenn., 03-05-2007 02:47:03  
hi mike and every one thanks for the replys
the tractor is a tea 24 85 bore. in new zealand. acording to the serial number she is from 1954. it has been converted to 12volt at some stage i imagine. i had a 12 volt coil on her and it cooked it self and replaced it with a new one last week also 12 volt which also gets to hot to touch, it is a bit anoying as you are working with her some were down the back of the farm and she claps out.

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