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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Bench Testing a 9N coil

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Chuck Gibson

06-26-2006 09:30:00
12.193.168.82



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Can anyone tell me how to bench test a coil on a 9N front mount tractor? I have an ohm meter but do not know what it should be reading. The tractor was running great but overheated. I let it cool off and it fired right up. After mowing for about ten more minutes the tractor backfired a time or two and shut down. After that I could get no fire. I replaced the points but am still not getting a spark. Also, does anyone know what kind of reading I should get across the condensor?
Thank you much,
Chuck

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Chuck Gibson

06-27-2006 19:43:21
12.193.169.187



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
I think I posted the following message wrong and it caused me not to get any more reply's. Please forgive me if I have worn out this subject!

Thank all of you for all of the quick responses! Some of you asked the question... 6v or 12v? It has a 12v alternator and battery running but to the best of my knowledge it still has a 6v coil. At the time I converted it from the old 6v generator I was told that everything else would work just fine. Surprisingly enough, it has ran like that for about 5 years. What is your opinions on that?
Thanks again,
Chuck

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Chuck Gibson

06-26-2006 15:11:19
12.193.169.39



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
Thank all of you for all of the quick responses! Some of you asked the question... 6v or 12v? It has a 12v alternator and battery running but to the best of my knowledge it still has a 6v coil. At the time I converted it from the old 6v generator I was told that everything else would work just fine. Surprisingly enough, it has ran like that for about 5 years. What is your opinions on that?
Thanks again,
Chuck

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sawmill

06-26-2006 14:30:07
71.126.133.9



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
First you unsnap the coil and put it on a bench. Attach a wire from a good battery, pos or neg, to the top connection. Then place a finger on the little spring thing on the bottom of the coil. At this time, connect a lead from the other battery terminal to the little flat tab found on the bottom of the coil. Touch it only briefly and then remove it. If you are not calling me everything but a Christian, it doesn't work. If you have a pacemaker or a weak heart, forget the above. Sawmill

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souNdguy

06-26-2006 11:35:22
12.65.192.81



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
These is no easy shadetree mechanic coil test.. unless you have a real ignition anylizer.. or other specialized equipment for testing a coil.. like . I think.. Bob on the N forum does.

In any case.. you can do a few basic tests, and make a few assumptions based on that after watching it in operation.

First.. test for pimary continuity... Use ohm meter on lowers setting and test between top post and the pigtail contact on the bottom. Depending on the sophistication and calibration of your ohm meter.. you may read anywhere from 1/2 to 2 ohms.. ( also depending on if you are testing a 6v coil.. or 12v coil ). Ohm meters are just not real accurate. Now.. if it measures anywhere close.. the primary at least has continuity.. though some windings may be shorted... etc.

Test secondary.. from top post to flat spring contact.. should be using the kohm scale.. Should read somewhere in the 4-8k range.

Best way to diagnose these is to get good points set at .015, and install it ont he tractor.. run a hot wire right to the coil top and check spark by bumping tractor over in neutral.

many spark problems are dirty connections and bad switches.. lastly.. bad coils.. etc.

T do a cheapy non scientific test on the condensor, take the lead on the condensor and touch it to its case.. now.. set ohm meter on lowest scale. and put leads across the condensor case and lead. Watch the scale on the meter... ( analog is best ).. It will swing from a low resistance to a high resistance ( as the cap charges.. and will show infinite or so.. when it is fully charged. )

Your tractor itself will be the easiest diagnostic tool to test that coil.. short of some specialized bench equipment.

Soundguy

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ZANE

06-26-2006 11:31:43
64.12.116.10



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
If it sprayed hot steam and water on the distributor it may just be wet.

Take the cap off and let it air dry.

Also if it has antifreeze in it that can insulate the points and they won't work until they are cleaned. Spray something like brake cleaner on them and that will clean and dry them at the same time. Don't use any solvent that has a lubricant in it.

Zane



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Bruce (VA)

06-26-2006 09:47:48
159.169.223.252



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 Re: Bench Testing a 9N coil in reply to Chuck Gibson, 06-26-2006 09:30:00  
12v or 6v? Some of the real N electronic wizards will be along soon to help you out w/ the readings, but it won't help you much unless you have some very expensive testing equipment. If you do not have spark on a frontmount, check the ignition switch first, followed by the ballast resistor then pull the coil & stretch the pigtail a bit. Recheck your point gap at .015 on all four lobes, make sure the condenser lead isn't grounded and....the best one yet.....that you re-installed the rotor. And, remember, many a coil has been replaced because of a bad ignition switch.

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