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Harry Ferguson Tractors Discussion Forum
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Ignition coil getting hot

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Daniel Collings

05-06-2007 21:48:42




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Ive got a T20/30. While using the tractor I started noticing power issues. After a few minutes the tractor just quit. I checked the switch and battery. While checking the voltage to the coil I noticed that it was extremely hot. I was wondering what might cause one to get so hot. The tractor has a 12V neg ground system. The coil is labeled that it does not need an external resistor. The coil + side is going to the key switch and is getting power when the key is on. The - side of the coil is going to the distributor. Could I have a bad ground or somethig? Or is this just a sign of a bad coil?
D

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Jerry/MT

05-07-2007 10:50:01




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 Re: Ignition coil getting hot in reply to Daniel Collings, 05-06-2007 21:48:42  
Your coil is hooked up correctly and might get warm during operation but it should not get really hot. The fact that it stopped running indicates an internal short. (Check the spark (FAT & BLUISH-WHITE) the next time it happens to verify it as the problem.) Usually when they cool down, they work again then overheat and stop the ignition system from working. NAPA IC-14SB coil costs about $15 and is a good replacement. How is your charging system working? Usually you don't have this problem with a solid state regulator but the old electromechanical regulators could "over charge" and this could cause a coil to fail (also the points would burn up).

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Daniel Collings

05-07-2007 12:10:21




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 Re: Ignition coil getting hot in reply to Jerry/MT, 05-07-2007 10:50:01  
This tractor has a 12V Alternator that looks like the unit that is in the TIMKIN (i thik that is right) catalog advertised as the 6 to 12V kit. I think it has an internal regulator. The amp guage shows charge after it reaches a certain RPM. I may need to take the alternator and have it checked to see if the regulator is blown. The ampmeter seems to bounce on the + side when the engine is running. That kind of makes me think that one of the diodes are blown.

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Daniel Collings

05-07-2007 11:35:53




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 Re: Ignition coil getting hot (checking for spark) in reply to Jerry/MT, 05-07-2007 10:50:01  
Jsut for the sake of asking. Is this how you would chck the spark?

1. Take the plug out. (with the tractor in the off position) 2. Ground the threaded part of the plug to the body. 3. Attemt to start watching the spark.



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Jerry/MT

05-07-2007 13:14:35




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 Re: Ignition coil getting hot (checking for spark) in reply to Daniel Collings, 05-07-2007 11:35:53  
Here's how I do it. Pull the center wire out of the distributor and slide the boot back to expose the metal clip on the end. Hold it near a good ground0 like the block or eeven a spark plug from which removed the boot, and try a start. You need to hold it about 1/8-3/16" inches away from the ground. You should see a FAT, BLUISH-WHITE SPARK. Be carefull not to get your finger too close to the end of the wire.

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gshadel

05-07-2007 14:09:28




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 Re: Ignition coil getting hot (checking for spark) in reply to Jerry/MT, 05-07-2007 13:14:35  
I probably have too much time on my hands. I made a "test spark plug". I used an old, but servicable spark plug, cleaned it,gapped it, soldered a wire on the threads, and an alligator clip on the wire. Clip the plug to a good ground, install a plug wire onto the test plug and crank the engine. I hang the plug in the air by the wire so I don't become part of the spark path myself.

George



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Gerald J.

05-07-2007 07:40:44




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 Re: Ignition coil getting hot in reply to Daniel Collings, 05-06-2007 21:48:42  
Is that a 6 volt or a 12 volt rated coil that needs no resistor. If 6 volt on a 12 volt tractor it still needs a resistor.

If its a 12 volt coil and heating excessively, its dying. It will get hotter and start failing while hot and probably still run when cool. Its not reparable, only replaceable.

Gerald J.



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Daniel Collings

05-07-2007 12:11:07




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 Re: Ignition coil getting hot in reply to Gerald J., 05-07-2007 07:40:44  
Its a 12V coil that doesn't require an external resistor.



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toolman

05-07-2007 01:09:21




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 Re: Ignition coil getting hot in reply to Daniel Collings, 05-06-2007 21:48:42  
Usually when they get hot and quit the coil is going bad, when it cools of for a few hours and starts up again and only runs a short time and quits again it is time for a new one.



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Bob (Aust)

05-07-2007 06:16:02




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 Re: Ignition coil getting hot in reply to toolman, 05-07-2007 01:09:21  
Question: Is your tractor still positive (+) earth? Sounds like high resistance in the coil - i.e. about to quit!



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Daniel Collings

05-07-2007 12:12:13




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 Re: Ignition coil getting hot in reply to Bob (Aust), 05-07-2007 06:16:02  
It has been changed to 12V neg ground and has a 12V alternator and battery. I'm wondering what may be causing the high resistance.



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