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Tractor Talk Discussion Forum

Ignition coil testing

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09-29-2012 13:11:34

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I want to check the resistance of an ignition coil. At what terminals do you put the ohms meter on to check the primary resistance. And at what terminals do you put the meter on to check secondary resistance. Manual I have says 1.06-1.07 ohms primary and 3800-4300 ohms secondary.

I am not electrically smart so don't beat me up.

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Dell (WA)

09-29-2012 14:24:27

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 Re: Ignition coil testing in reply to JOB, 09-29-2012 13:11:34  
JOB........surprizinly enuff, yer manual is correct. Just measure between the 2-little side terminals of yer round can ignition coil for primary winding resistance. And NO it don't really matter which meter lead connects to which little terminal. Ohm meters have own internal battery to run the meter. Then measure from either little terminal to the CENTER sparkie terminal. Again it don't matter which terminal ...or... which lead you use. And unless you squander yer money on "lab-grade" digital ohm meter, you will probably gitt "zero" ohms between the 2-little terminals. And about 4000-ohms between the center terminal and either of the little terminal.

More better the question, WHY do you think you need to measure yer sparkie coil resistance???

More better you make my "secret" calibrated sparkie tester by BENDING the side electrode of enny sparkie a full 3/16"-gap. Now clamp yer sparkie metal shell to enny convenient bracket so you can see the sparkies jump the gap between enny sparkie wire and my tester and ask yer self this question? Do the sparkies jump the 3/16"-gap with BLUE-SNOTT authority ...or... are they a WEAK yellowish-orangish poor excuse??? .......Dell, yer self-appointed sparkie-meister

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09-29-2012 19:19:27

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 Re: Ignition coil testing in reply to Dell (WA), 09-29-2012 14:24:27  
To more better question, this engine will run but then dies. I have a yellow spark at the plugs. fuel and compression. I put a gravity temporary fuel tank above the carburetor to make sure it was not the fuel pump. This engine is giving me fits.

John T may have my answer but I did not understand him.

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John T

09-29-2012 14:23:17

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 Re: Ignition coil testing in reply to JOB, 09-29-2012 13:11:34  
Just be aware a simple low voltage Ohms & Continuity check will show if a coil is badddddddddd (an open) but just because it pases dont mean a coil is good, cuz it can have HV breakdwown in the secondary once HV is present and/or once shes warmed up.

John T

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09-29-2012 19:11:35

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 Re: Ignition coil testing in reply to John T, 09-29-2012 14:23:17  
John, I said I was not electrically sharp. You need to speak English. Or better yet talk to me like you would a 6 year old.

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09-29-2012 13:53:13

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 Re: Ignition coil testing in reply to JOB, 09-29-2012 13:11:34  
Secondary= Measure from either small terminal to the high voltage tower contact (one will be a tiny bit less than the other). Primary= Between the little posts. There is no ground to case on a coil like these. Jim

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09-29-2012 19:13:29

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 Re: Ignition coil testing in reply to Janicholson, 09-29-2012 13:53:13  
Thanks for the help I will check it in the morning.

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