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Farmall & IHC Tractors Discussion Forum
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how to check coil

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o4terry

12-20-2003 07:15:23




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Is there a simple way to determine if a coil is ok without putting it on a tractor.

Can coils be bad one day and good the next?




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Heath

12-20-2003 18:37:02




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 Re: how to check coil in reply to o4terry, 12-20-2003 07:15:23  
If you can put it on the tractor the thing to do is take off the distributer cap. Hook a spark plug wire and spark plug to the top post of the coil. Ground the spark plug and with you finger open and close the points. You will see what kind of spark you are getting as well as how the points and condenser are working. You should make sure the points are set right because if the fiber block is wore they won't open for some of the cylinder positions (square cam for 4 cylinder, hex for six cylinder) and they will misfire. A dealer can apply very high voltage to your coil which will find a bad coil in a hurry.

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buck

12-20-2003 10:13:37




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 Re: how to check coil in reply to o4terry, 12-20-2003 07:15:23  

Yes they can be good one second and bad the next. Shadetree method is to connect + side of coil to + side of battery with jumper wire and provide jumper wire a few feet from - side. With the primary(large wire that goes to distributor) held firmly about 1/4" from - momantarily touch -of coil to -jumper wire. If coil is good you will get a good spark off the primary. This is actually duplicating in function of the points in slow motion.

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Wayne Swenson

12-20-2003 18:16:26




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 Re: Re: how to check coil in reply to buck, 12-20-2003 10:13:37  
Buck: As a teacher (mechanics) I need to correct your terminology.
The spark from the coil is produced at the Secondary terminal.
Primary input voltage is either 6 or 12 volt; Secondary voltage is 10,000--25,000 volts or thereabouts depending on the system.



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The Red

12-20-2003 07:53:23




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 Re: how to check coil in reply to o4terry, 12-20-2003 07:15:23  
What type of problems are you experiencing?



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